Touch controls
On the board, swipe sideways to move, tap to rotate clockwise, or tap with two fingers to rotate counterclockwise.
Slide down slowly to soft drop, swipe down quickly to hard drop, or swipe up to hold.
Adjust touch sensitivity in Settings.
The four numbers below the board
Holes: empty cells trapped under blocks. Aim for zero.
Bumps: total height difference between neighboring columns. Lower means flatter; aim for four or less.
Wells: single-cell-wide gaps at least two rows below their neighbors, which need an I, J, or L piece to fill.
Remaining: empty cells below the highest occupied row, plus the remainder when divided by four. A remainder of zero means pieces can fit exactly at this height (matching parity).
With the ghost ON, an orange “→ predicted value” appears.The sentence below explains why the AI chose that spot.
The bottom line (“Drop here…”) is always shown, even with the ghost OFF. Find a spot yourself, then use the rating to check your choice.
One large NEXT piece
The ghost looks ahead one piece, so the preview does too.
A faint preview also appears at the top right of the board so you can see the next piece without looking away. It briefly brightens when you place a piece—use that moment to plan your next move. Disable it with “Show NEXT on board” in Settings.
Enable “Show NEXT placement” in Settings to see where the AI plans to put the next piece, drawn with a dotted outline in that piece’s color. Use it to practice two-move sequences.
Orange dotted outline = best-move ghost
The AI calculates the best placement for each piece. It does not suggest moves that require HOLD, so you can practice handling the current piece. You can still use HOLD whenever you want.
A thin gray dotted outline marked “2” shows the runner-up, but only when it is close to the best move. If it is absent, there is no comparable alternative.
By default, the AI looks ahead to the first NEXT piece. Under “Ghost lookahead” in Settings, choose Current piece only (ignore NEXT and evaluate only this piece) or Any next piece (favor moves that work well with any of the seven possible next pieces).
By default, suggestions are limited to placements reachable by moving sideways and dropping. Change “Ghost techniques” to Include tucks to include advanced rotation-kick placements. These are shown as a purple dotted outline marked “Tuck”. Drop the piece first, then rotate it into place.
9-column flat-stack mode
Leave one edge column (the well) open and practice keeping the other nine columns flat. The well is shaded; when four rows are ready, it glows green. Drop a vertical I piece there to clear four lines. Placing another piece in the well triggers a warning. Choose the well’s side in Settings.
Accuracy
Each placement is compared with the AI’s best move using the same evaluation, then rated Perfect / Great / OK / Miss . ACC at the top is your average score. A rising score means you are improving.
Toggle the ghost during play
Use the top dotted-square button to toggle the ghost instantly (orange = shown, gray = hidden). Try finding a move yourself, then show the ghost when unsure. Re-enabling uses your chosen mode: Always, Check, or On mistakes.
Pause = gravity off
Press the button at the bottom right ❚❚(next to the numbers, within thumb’s reach) to stop falling and the timer while keeping the board visible. Move pieces while paused and compare holes, bumps, height, and ratings.Hard-dropping a piece automatically resumes play.
Suggested practice
1. Use Always and copy the ghost. 2. Switch to Check and think for yourself. 3. Use On mistakes to focus on weak spots. Gradually reducing help makes the skills stick.
Keyboard (on desktop)
←→ Move ↓ Soft drop Space Hard drop
↑ / X Rotate CW Z Rotate CCW C Hold Esc Pause