Fit the falling blocks together to fill complete rows. Full rows clear and score points. Every 10 lines the level goes up and blocks fall faster. The game ends when the stack reaches the top.
Keyboard
←→ Move
↓ Soft drop
↑ / X Rotate · Z Rotate back
Space Hard drop
C Hold piece
P / Esc Pause
F Full screen
M Sound on / off
Touch
Tap the board to rotate
Drag sideways to move
Drag down to soft drop
Flick down to hard drop
Flick up to hold
Or use the buttons below the board
Bonus pieces
Bomb Clearing lines charges the Power meter (a 4-line clear charges it fastest). When it is full, your next piece is a bomb. It wipes out the 3 rows around where it lands.
Laser The first time your stack reaches the red zone you get one free rescue laser. It wipes out every row it covers, so stand it upright to clear 4 rows.
Mega clear Clear 3 or more rows of blocks with a bonus piece for double points.
Hazards
Frozen rows Sometimes a cleared row freezes into ice instead of vanishing. Your next line clear cracks it and the one after shatters it for bonus points. Bombs and lasers break ice straight away.
Blackout Every so often the lights go out for 8 seconds and only the area around your falling piece stays lit.
Cursed piece Now and then a dark crimson piece arrives that cannot be rotated. You can see it coming in Next. Once it lands it clears like any other block.
Turn any hazard on or off under Hazards beside the board, or on the start screen.
Scoring
1 line 100 · 2 lines 300 · 3 lines 500 · 4 lines 800, multiplied by your level. Drops add bonus points.
Stack Panic