Two-colored pills fall into a 7×14 jar. Line up four or more of the same color in a row or column to clear them — cascades trigger chain bonuses.
A two-cell pill spawns at the top and falls automatically. Tap to rotate it 90°. Swipe left or right to move (one cell per ~20 px of swipe distance). Swipe down to hard-drop. Whenever the board contains four or more same-colored cells in a horizontal or vertical line, those cells clear, everything above falls, and the chain continues — bigger chains score more. The game ends the moment a new pill cannot spawn at the top center.
Stack with cascade in mind. Placing a pill so its top half completes a future line is much weaker than placing it so its top half is the same color as the column above the gap it will fall into. The score on a clear is fine; the score on a 3-chain cascade is 3× plus the chain bonus.
Don't waste the same-color pill. When both halves are the same color, you have a free two-cell run. Drop it vertically into an existing column of that color to instantly make a 4-run, or horizontally to seed a wide row. Wasting a same-color pill on random terrain is the single biggest score leak.
Watch the back of the queue. The fall speed accelerates with every pill placed, so the cascades you build in the slow opening must still resolve when each pill gets only a fraction of a second. Build wide, flat foundations early — they're forgiving on rotation and fast-move mistakes when speed picks up.
Leave one open column on each side. The board is 7 wide and the pill spawns horizontally — keeping cells 0 and 6 mostly empty gives you space to flush a wrong-colored pill off to the side. Burying the edges leaves you forced to drop top-center, which is where game over starts.