NES Tetris decision trainer
It sets the board and hands you the piece. No gravity, no timer — take as long as you want, place it where you want, then commit. Afterwards it tells you the right answer, and whether a human at your rolling rate could have made it.
Session
Keys
←→ shift Z/↑ rotate cw · X rotate ccw ↓ nudge down Space/Enter commit placement
N next puzzle R/D replay this board C play on from the result −/= level 1–4 rolling 12/20/30/40 Hz
A auto-play — the engine plays its best reachable placement, stack after stack, so you can watch the strategy work. Any piece key hands control back.
How it judges
Nothing moves until you commit — this is the decision, not the execution. When you lock in, the trainer runs a monte-carlo search: every reachable placement is played out over and over against random NES piece sequences, and ranked by expected tetrises (with lines and survival as tiebreakers). The right answer is the tetris-hungry placement reachable at your rolling rate. Lock in a placement your hands could not have made, and it is called UNREACHABLE even if it scores best.