Everyone gets the same board each day. Swipe or use the arrows to slide on ice until you stop.
Slide into a blob of your color and you grab it and keep going, collecting every blob of that color in your path — that's a chain. Slide into a different color and you bounce off, become that color, and drop an ice block where you stopped. Slam into your own ice blocks to stop mid-board and line up the next chain.
Each chain scores length squared (a chain of 4 is worth 16), so long single-color lanes are gold. Clear every blob for a sweep bonus. Bank your score when the board has nothing left to give — it locks in today's run for the leaderboard.