STACKCRAFTLAB

A small game. A better decision.

THE PLACEMENT LAB / 001

Make your next move.

A familiar game. Room to think. Every placement counts.

AT THE CONTROLS

YOU

Human intuition

Your board. Your call.

Ready to play

SCORE0

LINES0

PLACED0

SAME SEED, SAME PIECES

Piece sequence

Change the seed for a new challenge.
Keep it to try a different strategy.

YOUR BOARDMOVE 001

RUN COMPLETE

One more try?

No legal placements remain.

Choose your landing spot LANDING GHOST

REPLAY · RECORDED MOVES

0 / 0

CURRENT PIECE

—

UP NEXT

One move ahead.

TAKE YOUR TIME

Find the fit.

Move the ghost. Rotate your piece. Drop when it feels right.

Choose position← →
Rotate↑
Place piecespace

Or tap a column on the board.

EVERY MOVE, REPLAYABLE

A tiny JSON file. An exact rerun.

SAME PIECES. DIFFERENT DECISIONS.

Recorded player comparison

Loading verified replay frames…

RECORDED REPLAYNo live model inference

Starts a new human game on this recording's seed, replacing your current human game. Bots remain recorded.

Loading recorded baseline games…

You

LIVE HUMAN

LINES: 0
SCORE: 0
PLACED: 0

← → choose · ↑ rotate · Space drop
No timer. Your move advances the recorded boards.

PIECE INDEX0 / 0

Synchronized by pieces placed.
Finished boards stay on their final frame.

Recorded decisions. Playback speed does not represent decision latency.

Full study results

Recording provenance

Built for fair comparisons. Deterministic seven-bag pieces. One-piece preview. Straight drops.

The research rules

Stackcraft is a simplified, turn-based falling-block game on a 10 × 20 board. There is no gravity timer, hold, wall kick, tuck or T-spin bonus. Clear 1 / 2 / 3 / 4 lines to score 100 / 300 / 500 / 800 points. All players will use the same rules. Comparison boards replay measured model decisions; the human board runs live.

STACKCRAFT / RULES V1