Commands

Swipe a gem towards a neighbour to swap them, or tap one gem and then a neighbour.
Arrows / WASD: move the cursor. Hold to repeat.
Enter / Space / OK: pick the gem under the cursor. Then an arrow (or OK on a neighbour) swaps it.
1 / Q: Hammer. Then OK or tap the gem or ice block to smash.
2 / R: Shuffle booster.
3 / X: +5 moves, or +10 seconds on timed levels.
4 / H: hint. The game also shows a hint by itself if you wait about 7 seconds.
Backspace / B / Esc: cancel a pick or the hammer. Press it twice during a level to give up.
World map: arrows choose a level (Up/Down jumps a world). OK or a second tap plays it. Back returns to the menu.
Menu: 1 World Map, 2 Endless (or Daily Challenge), 3 Log off (press twice).
Choices menu: pause, how to play, new game, sound, difficulty, save slot, theme.