ROWFill one wall across and that wall's row clears. Other walls don't move.
LINKBlocks touching across a corner connect walls (a link bar joins them). A full wall connected to an unfinished one waits until you finish every connected wall: bigger bonus. Cover the gap and the link breaks: the full wall just clears. Only full walls ever clear.
RINGMore full walls in one row pay more: 2 walls x4, 3 walls x9. All four: RING.
PUREEvery piece comes in one of five colours (NEXT and HOLD show which; each colour has its own hatching too). Clear a wall that is all one colour and it counts double: PURE. Linked walls all in one colour: BANNER. A whole ring in one colour: HERALDRY, x5. The Bandit's red and a seized piece's grey stone have no colour.
BANDITArcade: a rival drops pieces on walls behind you (warned 3 pieces ahead). His piece is solid: you can't slide, turn or ease down into it, and if it falls on your piece it SMASHES it down. Cut him down with a hard drop through him, or a DASH sideways through him (SHIFT + arrow; on touch a fast flick): a SLASH: he takes your piece with him, and your next piece falls on his wall. While one falls, HOLD becomes SEIZE: take over his piece where it is and place it yourself; your own piece comes next. Or let him land and clear his blocks to slay him. His rows pay but never touch your combo.
TOUCHDrag left/right to move. Tap the right half to rotate right, the left half to rotate left. Flick down to drop, drag down slowly to ease it down. Swipe up to hold. Flick fast sideways to DASH half-way round the tower (once a piece). Flick down, or sideways, through the Bandit to SLASH: both pieces go down, and the next drops on his wall.