Merge freely from 2 to 32. Tiles at 64+ enter a warning phase, then become bombs. Bigger bombs get more time. Defuse to keep your tile and keep merging.

Ark lost

Safe | 2-32

Warning | 64+

Bomb | value + timer

How to play

Build: merge 2 to 32 normally; reaching 64 starts a 5-turn warning, then betrayal
Bombs: show both the tile value and a countdown
Defuse: slide a matching tile into a bomb - the bomb vanishes, your tile stays
Timers: higher value = more time - 64/70s, 128/90s, 256/110s, 512/135s, 1024/165s, 2048/200s
Rewards: defuse XP, combos, chapter stars, captain rank-ups