A Modern Competitive Guideline Stacker Training Tool

15 training modes, 7 of them powered by Cold Clear. Frame-precise controls. Targeted drilling for every competitive skill.

Download on theApp Store

3 free modes included. Unlock all 15 with a free trial.

Skill is built in feedback loops of input, read, correct, and repeat. For decades, the traditional way to practice has been to play normal games and hope the situation you want to drill randomly surfaces. It's a fool's errand for deliberate practice. Liemtris isolates the loop you're training and runs it to exhaustion. 15 modes. Cold Clear analysis. Frame-precise controls.

15 Training Modes
Cold Clear Analysis
All Skill Levels

Core Gameplay

The baseline modes: standard guideline play, survival under garbage pressure, live T-Twist pattern detection, and combo-training terrain.

Normal

Free

Standard guideline play with 7-bag randomizer.

Full guideline rule set with SRS rotation, complete wall-kick tables, 7-bag randomizer, T-Twist detection via 3-corner rule, and back-to-back and combo scoring. The baseline mode all other training modes build on.

Survival

Cold Clear

Cheese Race. Configurable garbage rate, trains smart downstacking.

Also known as Cheese Race. Garbage rows with single holes insert at a player-configured rate, pushing the stack toward the ceiling. Every block placed on top of a hole costs ~2.5 pieces on average to dig back out, so Survival trains the discipline of clearing holes before they get buried. Row-type-aware hole generation produces realistic garbage patterns.

T-Twist Finder

Cold Clear

Find the guaranteed T-Twist in N moves or fewer.

Liemtris hands you a board and piece queue containing a guaranteed T-Twist solvable in N moves. Find it. Toggle the Solution button to overlay the answer as ghost pieces. The most direct way to train attack and firepower.

4-Wide

Pre-built 4-wide towers with open center channel for combo training.

Columns 1–3 and 8–10 are pre-filled with regenerating garbage towers. Center channel is open for 4-wide combo stacking. Trains decision-making for maximum combo continuation.

The Engine

The Cold Clear Engine

Cold Clear was trained on 100 million competitive guideline versus games for attack speed. It learns to hold T-pieces back for attacks rather than burn them in stack fill, maintains back-to-back, fires combos and spikes when the situation calls for it, and looks 20 moves ahead under pressure. This is the engine every top competitive streamer trains against, and it powers every AI-assisted mode in Liemtris.

Speculative Previews

Ghost-piece overlay showing the bot's next intended placements, updated per move.

Bot Suggestions

Real-time placement analysis surfacing the bot's chosen move during gameplay.

Finesse Preview (0–6)

Player-controlled lookahead depth for input-sequence display.

Auto-play 1×–10×

Let the bot play at any speed from slow-motion study to full-speed pressure viewing.

31 bot weight parameters

B2B, bumpiness, wells, T-Twist bonuses, PC bonus, plus stacking-paradigm preferences (2-7, 6-3, 5-4, 9-0), T-piece preservation, Quad priority.

Named bot weight presets

Save aggressive, defensive, C4W-tuned, or community-shared parameter profiles.

Hacker-Type

Just for fun. Press random keys and Cold Clear governs the actual movement, so it looks and feels like you're playing fast and smart.

Modes powered by Cold Clear

  • T-Twist Finder
  • T-Twist Sandbox
  • Infinite Finesse
  • C4W Stacking
  • Survival
  • Finesse Trainer
  • Visualization

Finesse & Visualization

Input-precision and cognition drills: finesse sequences, piece-landing prediction, flash-based board reading, and infinite piece-shaped carvings.

Finesse Trainer

Cold Clear

Isolated finesse drills, filterable by piece, rotation, and column.

Toggle on Cold Clear's piece projection so the where-to-place decision is off your shoulders and you can focus purely on input mechanics. Filter by piece type, rotation, and column to drill the cases you struggle with. Best run with Hold disabled in this mode's settings so nothing switches the current piece and you get a clean barrage to execute.

Infinite Finesse

FreeCold Clear

Endless finesse drills inside piece-shaped carvings.

Stream of piece-shaped holes appears on the board. Player fills each with the matching piece using optimal finesse input. Two sub-modes: pure drill (random piece/rotation/column selection) and Game-Flow (carvings placed inside bot-guided realistic board states). Per-piece-type, per-rotation, per-column filtering.

Visualization

Cold Clear

Predict the resulting terrain from a sequence of inputs without ever seeing them placed.

Trains your mind's eye to picture the future state of a board so you can instinctively read several pieces ahead instead of being anchored to the current state. The mode hands you a terrain plus finesse movements for 1–6 pieces; your job is to visualize the resulting terrain without placing them. Press the Solution button to check.

Subitizing

Trains instant recognition of gap widths in your stack.

Subitizing trains your ability to instinctively know how wide a gap you need to fill is. Columns or piece shapes flash on the board for a player-configured duration (0.1s–2.0s); you identify the count or shape from memory. Two flash styles: Columns and Tetromino.

Opener & PC Training

Controlled-queue practice for named openers, continuation drilling from bag 2 onward, and PCO setups across 4 configurations.

Opener Practice

Custom-opener entry, continuation drilling, and mirror support.

Enter any opener you want to practice and Liemtris generates only the bags that can produce it, so every attempt drills the correct muscle memory. Practice bag 1 in isolation, then bag 2, bag 3, and beyond by selecting continuation nodes. Mirror mode doubles pattern coverage. Quiz mode presents a queue and asks whether the bag can produce the selected opener, training the mental calculation instead of the motor execution. Reference visuals for the opener remain onscreen during practice.

PCO

Perfect Clear Opener from 4 setup variants with custom queues.

Perfect Clear Opener setups across 4 configurations with player-selected piece queues. Win condition is achieving the perfect clear. For drilling PCO entry, stabilization, and continuation.

Pattern Recognition

Cold Clear-backed pattern training: C4W construction, live T-Twist sandbox, overhang puzzles, asymmetric height-difference setups, and forecastable-pattern drills under garbage pressure.

C4W Stacking

Cold Clear

Center 4-wide opener and side towers, tuned across every bag.

Cold Clear has been tuned to open and maintain C4W against any bag sequence. The opener builds a 3-block residual in the center 4 columns, choosing residual shapes with the most continuations rather than obscure ones, then constructs the two side towers around it. Side selection for the left or right 4-wide stack is coming soon. Practice anticipating the bot's placements, or let it play and study its construction directly.

T-Twist Sandbox

FreeCold Clear

Drill T-Twist calculation against fresh queues on a familiar terrain.

Most T-Twist practice burns out the moment you study a board, find the answer, and move on to a brand-new board. Sandbox keeps the terrain fixed so it stays loaded in your head, then regenerates the queue each round, so your job is to determine whether a T-Twist can be built from each new sequence. Generate as many queues as you want against the same terrain. Real games hand you effectively random queues; this trains the muscle of solving any of them.

Overhang Puzzles

Every 1–5 piece overhang setup, exhaustively drilled.

Most players know 3 or 4 of the simple overhangs. There are hundreds of ways to combine pieces to create an overhang. Liemtris has calculated every possible overhang from 1 to 5 pieces and serves them as focused drills so you can learn them all instead of the handful you happened to discover in casual play.

Height Difference

Every way to resolve every left/right height delta.

The foundation of a T-Twist is resolving the height difference between flanks, because there is no twist until the setup is level. Liemtris has calculated every possible way to resolve every height delta and presents them all. Filter by side (left, right, both) and by available pieces to focus on the cases you're weakest at.

Forecast

Pre-insert attacks under your stack and learn what discovered attacks look like.

Most players neglect that the stack beneath the current terrain feeds future terrains. That's a missed opportunity, because pre-emptively planted overhangs can expose a T-Twist the moment intermediate lines clear. Setups like these are a pain to find and visualize. The traditional approach is to play normal games and hope one randomly surfaces so you can recognize and act on it. Forecast lets you insert the attacking opportunity directly under your stack, so you can learn on demand what a discovered attack looks like on your board.

Roadmap

Kick Trainer

Coming Soon

Walkthroughs of every SRS kick, including rare and asymmetric kicks.

Every SRS kick presented with the terrain that produces it, the rotation input, and the resulting finesse. Includes the asymmetric I-piece kicks and the rare kicks most players never encounter in normal play.

The Settings Catalogue

Configurable parameters.

Every setting surfaced in Liemtris, organized by system. Tier indicators mark standard, niche, and novel features relative to other competitive stackers.

StandardNicheNovel

Handling & Input

01

Per-device input tuning: DAS, ARR, soft drop, and tap-back DAS independently configurable for keyboard, on-screen stick, and gamepad.

  • DAS / ARR / Soft Drop Speed

    DAS, ARR, and soft drop speed independently configurable down to 0ms.

  • Tap-Back DAS + Window

    A second DAS charge kicks in the instant you reverse, within a configurable window.

  • Three parallel handling profiles

    Keyboard, on-screen stick, and gamepad stick each with their own DAS, ARR, tap-back, and soft-drop settings.

  • Stick activation + release hysteresis

    Hysteresis on stick activation and release eliminates input chatter near center position.

  • Per-cardinal stick zone angles

    Configurable angular boundaries for each cardinal stick zone.

  • Rotation-stick hysteresis

    Analog rotation that doesn't double-fire on release.

  • Stick debug overlay

    Real-time angle, magnitude, and zone readout for calibrating the thing you're holding.

  • Undo DAS + Undo ARR

    Independent DAS and ARR settings for undo scrubbing, distinct from in-game handling.

  • 3 bindings per action, press-or-hold

    Up to 3 bindings per action, each distinguishing tap vs hold for dual-action mapping.

  • Context-scoped conflict detection

    Per-context conflict detection prevents silent collisions across gameplay, menu, and overlay bindings.

  • Keyboard layout presets

    WASD or arrows with one tap, for setting up a new device fast.

  • DAS pipelining

    Advanced piece-placement technique: queue DAS charges across piece transitions to place consecutive pieces without re-holding the direction.

The Cold Clear Coach

02

Cold Clear engine controls: 31 weight parameters, named presets, and per-mode overrides.

  • 31 exposed bot weight parameters

    B2B, bumpiness, wells, T-Twist bonuses, PC bonus, and 26 other Cold Clear weights exposed for per-mode tuning.

  • Named bot weight presets

    Save named parameter sets including aggressive, defensive, C4W-tuned, stacking-paradigm presets (2-7, 6-3, 5-4, 9-0), T-piece preservation, Quad priority, and B2B priority. Import/export for sharing.

  • C4W heuristic set

    Center-4-wide training with its own residual, parity, density, and burn weights.

  • Piece Preview: Live vs Stable

    Bot plan preview updates every move (Live) or freezes until player deviation (Stable).

  • Finesse preview count 0 – 6

    Finesse-sequence preview depth configurable from 0 to 6 pieces.

  • Bot auto-play 1× – 10×

    Bot auto-play speed configurable from 1× to 10× for study or pressure-training.

  • Hacker-type bot mode

    Any key input executes the next Cold Clear-optimal move. For muscle-memory drilling against optimal play. (Just for fun.)

  • Force-Calculate mode

    Freeze player input and trigger the bot to reveal the optimal placement. Undo to attempt the move yourself. Drill the same situation until the pattern is ingrained.

  • Bot Allow Hold toggle

    Toggle hold availability for the bot to force hold-less solution drilling.

Overlays nobody else shows

03

Board overlays for spawn axis, rotation axis, bag boundaries, and placement-order projection.

  • Spawn-axis column indicator

    Column-5 indicator marking the piece spawn and rotation axis.

  • Rotation-axis column highlight

    Vertical stripe overlay marking the active piece's rotation pivot column.

  • Rotation axis on the ghost piece

    See the pivot dot before you rotate. Predict the kick.

  • Rotation axis on the active piece

    The pivot moves with the falling piece, live.

  • Bag separators in the next queue

    Visual separators between bags in the next queue for bag-boundary awareness.

  • Per-mino vs centered projection numbers

    Placement-order digits rendered per mino or as a single digit at the piece centroid.

  • Grid-line prominence multiplier

    Grid-line visibility multiplier from 0.5× to 2×.

  • Ghost style: dashed or solid

    Ghost piece render: dashed or solid, with configurable opacity and line width.

  • Hide active piece entirely

    Hide the active piece entirely, forcing placement prediction from ghost alone.

  • Hide hold entirely

    Hide the hold slot to force memory-only play.

  • Next queue size 0 – 6

    Next-queue visibility from 0 (blind) to 6 pieces.

Training Systems

04

Asymmetric generators, queue recall, subitizing, and live Cold Clear puzzle generation.

  • Infinite Finesse Game-Flow mode

    Finesse carvings placed inside Cold Clear-guided realistic board states instead of isolated puzzle boards.

  • Queue Recall

    Queue is hidden after a preview window; player reconstructs the piece sequence via ring selector. Configurable queue length; optional hold inclusion.

  • Subitizing drills

    Flash-based column or piece-shape recognition; duration configurable 0.1s–2.0s.

  • T-Twist Finder + Sandbox

    Live Cold Clear generation produces unique T-Twist puzzles every attempt; no fixed bank, no repeats.

  • Height-Difference generator

    Generator produces T-Twist puzzles with asymmetric left/right flanks. Independent piece-count filters, per-piece-type exclusions, unique-pieces-only toggle.

  • Overhang corpus + Puzzle Quality Scorer

    Pre-generated puzzles vetted for compactness, connectivity, vertical support.

  • Opener continuation nodes

    Drill bag 2, bag 3, and deeper continuation nodes in isolation without replaying bag 1.

  • Opener Quiz mode

    Presents a queue and asks whether the bag can produce the selected opener. Trains mental pattern matching. Mirror-mode compatible.

  • Mirror mode: original / mirrored / both

    Puzzle generator emits original, mirrored, or both variants to double pattern coverage from a single bank.

  • Forecast mode

    T-Twist, Quad, and insertion-pattern puzzles under configurable incoming garbage (1–4 rows).

  • Piece / rotation / column filters

    Drill-scope filters: piece type, rotation, and column. Combinable to target specific weaknesses.

Aesthetics

05

Per-element visual controls: skin presets plus hex-level overrides for minos, grid, board frame, and panels.

  • Named skins

    Named visual presets: Neon Synthwave, Papercraft, Origami, Sketchbook, Classic.

  • Metal-shader procedural backgrounds

    GPU metal-shader procedural backgrounds with configurable animation speed.

  • Per-piece hex color override

    Per-tetromino hex color override for custom or colorblind-safe palettes.

  • Grid-line tuning

    Grid-line color, width, glow radius, and wobble amount.

  • Mino tuning

    Per-mino outline, corner radius, gradient direction, outer glow, hatch and cross-hatch rendering.

  • Board frame tuning

    Width, corner radius, gradient, glow, wobble amount.

  • Panel tuning independent of board

    Hold and next panels styled independently of the playfield.

  • Empty-cell opacity independent of filled

    Empty-cell opacity configurable independently of filled-cell opacity.

  • Haptic profile with per-event textures

    Per-event haptic texture with configurable intensity and sharpness.

  • Impact animation toggle

    Board shake and tilt animations on wall hits and hard drops. Toggleable for competitive stability.

  • Background animation speed multiplier

    Background animation speed multiplier.

Scratch Pad

06

Board editor, custom queue, and seeded bags for ad-hoc setups and reproducible study.

  • Fumen-style direct cell drawing

    Finger-draw directly on the board to paint garbage blocks or colored region markers. Fumen-compatible.

  • Colored palette for region marking

    Colored block palette for zoning and annotation during study.

  • Board editor with force-calc safety

    Board editor with input guard preventing accidental piece placement during edits.

  • Saved puzzle library

    Save any puzzle to the library and re-drill it across sessions.

  • Custom queue editor

    Explicit piece-sequence editor for deterministic queues.

  • Seeded 7-bag for replay reproducibility

    Seeded 7-bag randomizer (Fisher-Yates + LCG) produces identical piece sequences across sessions given the same seed.

  • Queue regeneration

    Preserve the current board terrain while randomizing the hold piece and next queue. Drill planning against a familiar terrain with fresh pieces.

Stats & Analytics

07

Per-drill stats of attempts, success rate, placement errors, and best time, tracked by piece × rotation × column.

  • Per-drill finesse stats

    Attempts, successes, placement errors, and best time tracked per piece × rotation × column.

  • Puzzle attempts with daily breakdown

    Puzzle attempt counts with daily aggregation and rolling-baseline comparison.

  • Sortable finesse stats UI

    Sortable and filterable stats by piece, rotation, and success rate.

  • Weakest-drill detection

    Next-drill selection: 50% weakest-item priority, 50% random.

  • Per-session vs lifetime stats

    Session-scoped and lifetime-scoped statistics available as separate views.

Per-Mode Overrides

08

Per-mode setting overrides for every visual and bot parameter.

  • Every visual + bot setting is per-mode

    All visual and bot parameters scoped per-mode; switching modes loads that mode's parameter set automatically.

  • Puzzle solution preview persistence

    Puzzle hint-state persistence configurable: sticky across puzzles or reset per puzzle.

  • Hold disableable per mode

    Hold slot disableable per mode to force commitment play.

  • Hints toggle on puzzle modes

    Per-mode toggle for hint overlays on all puzzle modes.

  • Custom game-mode ordering

    Drag-reorder the mode grid.

  • Active-piece side-panel slot

    Active piece rendering relocatable to a side-panel HUD tile.

Data Portability

09

JSON export/import of all settings, iCloud Drive sync, file-level visibility.

  • Settings export to JSON

    Schema-versioned JSON export of all settings: bindings, openers, bot presets, and per-mode overrides.

  • Settings import from JSON

    JSON settings import with one-tap apply.

  • iCloud Drive sync, visible in Files

    Settings file stored in iCloud Drive, visible in the Files app for direct inspection, diff, and backup.

  • Reset to defaults

    Restore all settings to defaults.

Guideline Fidelity

Guideline rule-set conformance.

8 standards
  • SRS with full wall-kick tables
  • O-piece ignores kicks, I-piece has its own table
  • 180° rotation via double-CW kick chain
  • T-Twist detection: 3-corner rule + mini (2-corner)
  • Combo + B2B + Perfect Clear with level-scaled multipliers
  • Row-type-aware garbage hole generation
  • Seeded 7-bag (Fisher-Yates + LCG) for replay reproducibility
  • Line-clear logic disableable for terrain-only puzzle modes

Start Training Today

Normal, T-Twist, and Infinite Finesse are free forever. Ready for more?

Weekly

$7.99/week

~$1.14/day

Start 3-Day Free Trial

Then $7.99/week after trial. Cancel anytime.

Monthly

$24.99/month

~$0.83/day

Start 3-Day Free Trial

Then $24.99/month after trial. Cancel anytime.

Best Value, save 76%

Yearly

$99.99/year

$1.92/week

Start 3-Day Free Trial

Then $99.99/year after trial. Cancel anytime.

Controller Compatibility

Bring your own controller.

Configurable DAS/ARR, frame-perfect timing. Tested across first-party consoles, telescopic clip-ons, and the third-party gamepads competitive stackers actually use.

First-party flagships

PlayStation

  • DualSensePS5 · iOS 14.5+
  • DualShock 4CUH-ZCT1 / ZCT2 · iOS 13+

Xbox

  • Wireless Controller Series X|SModel 1914 · iOS 14.5+
  • Xbox One ControllerModel 1708 · iOS 13+

Nintendo

  • Switch Pro ControlleriOS 16+
  • Joy-Cons L/ROriginal Switch · iOS 16+ · single or pair

All other supported controllers

Popular picks

  • OhSnap MCONMagSafe snap
  • Backbone OneLightning & USB-C
  • Backbone Pro2025 · USB-C + BT
  • Razer Kishi V3 / V3 Pro / V3 Pro XL
  • Razer Kishi Ultra
  • 8BitDo Pro 2
  • 8BitDo Ultimate 2 BT

Console — Extended

  • DualSense EdgeiOS 16.4+ required
  • Xbox Elite Wireless Controller Series 2iOS 14+
  • Xbox Adaptive ControlleriOS 14+
  • N64 Controller for NSOiOS 17.1+
  • SNES Controller for NSOiOS 16.1+
  • Sega Genesis / Mega Drive Controller for NSOiOS 16.1+

Cloud Gaming

  • Amazon Luna ControllerBT mode · Action+B 3s
  • Google Stadia ControllerAfter one-time BT firmware flash

Telescopic — Lightning

  • Razer Kishi (original)
  • Razer Kishi V2 iPhone
  • GameSir X2 / X2 Pro / X5 Lightning
  • Hyperkin × GameSir X5 Alteron
  • Rotor Riot Lightning Controller
  • Gamevice (Lightning)
  • Riot PWR Cloud Gaming ControllerXbox branding

Telescopic — USB-C

  • Backbone One PlayStation EditionUSB-C
  • GameSir G8 / G8+ / G8 Galileo
  • Gamevice FlexUSB-C

Telescopic & Standalone — Bluetooth

  • SteelSeries Nimbus / Nimbus+
  • Nacon MG-X / MG-X ProiOS SKU · white
  • Turtle Beach Atom ControlleriPhone SKU
  • Scuf NomadMFi · iPhone-exclusive
  • Fortune MFi Wireless Gamepad

8BitDo — Other

  • SN30 Pro / SN30 Pro+ / Pro 3 (2025)
  • Ultimate BT / Ultimate 2C BT
  • Zero 2 / Micro / M30 / N30 Pro 2 / NEOGEO Wireless
  • Lite 2 / Lite SEAndroid mode only · iOS 16+

GuliKit

  • KingKong 2 ProNS08 / NS09
  • KingKong 3 Max / KK3 Max
  • KingKong Pro 3
  • Elves 2 / Elves 2 Pro

Flydigi

  • Vader 2 Pro / Vader 3 Pro / Vader 4 Pro
  • Apex 4
  • Direwolf 2

BIGBIG WON

  • Rainbow 2 ProXInput mode · pairs as Xbox Wireless Controller
  • Blitz 2 / Blitz 2 TMR
  • Gale / Gale Hall

Machenike

  • G3V2 / G5 Pro / G5 Pro V2 / G5 Pro Max SE / G6V2PE

Scuf

  • Scuf ReflexDualSense-based · iOS 14.5+
  • Scuf Instinct ProClaimed support · not widely user-confirmed

PowerA

  • MOGA XP5-i PlusMFi
  • MOGA XP5-X PlusWith iOS 17 BT

Other

  • Anbernic RG P01Standalone BT · dedicated iOS mode
  • Anbernic RG G01Standalone BT · dedicated iOS mode
  • Steam Controller (original)After BLE firmware flash

These models can't pair as standard iOS controllers — usually because they use proprietary wireless protocols, lack Bluetooth entirely, or are wired-only.

Console

  • DualShock 3Jailbreak only
  • PlayStation PortalWi-Fi Remote Play · BT is audio-only
  • Xbox 360 ControllerNo Bluetooth radio · proprietary Xbox Wireless
  • Xbox One Controller model 1537No Bluetooth hardware
  • Xbox Adaptive Joystick (2025)Wired-only accessory
  • Switch 2 Pro ControllerNew proprietary Nintendo BT protocol
  • Switch 2 Joy-Con 2Same proprietary protocol
  • GameCube Controller for Switch 2 OnlineSame proprietary protocol

Telescopic

  • GameSir X3 Pro / X5 Pro / X5s / X4 AileronAndroid-only
  • Rotor Riot USB-C ControllerAndroid-only
  • Razer Kishi V2 USB-CWorks unofficially as generic HID · no Nexus app
  • Nacon Revolution X / Revolution 5 ProXbox Wireless or no iOS BT

Questions & Answers

Your subscription auto-renews at the plan you chose. Cancel anytime before day 4 and you won't be charged.

Yes. Cancel from your App Store settings or Stripe dashboard. No cancellation fees, no questions asked.

Free: Normal, T-Twist Sandbox, and Infinite Finesse forever, with no account needed. Paid: All 15 modes plus Cold Clear features, undo keybind, and iCloud sync.

Yes. Subscribe here with Sign in with Apple, then sign in with the same Apple ID in the app to unlock your subscription.

Even if you choose not to train with Liemtris, your opponents will.

15 training modes. Cold Clear-backed analysis. Frame-precise controls. 3-day free trial; cancel anytime before day 4.

Download on theApp Store