Drop Twins into the tank. When two identical Twins touch, they merge into the next evolution and you score points. Keep merging to reach bigger Twins and higher scores.

Controls: Move the current Twin left/right, then release to drop it.

Combos: Multiple merges in a short time increase your combo and give extra points.

Multicolor Twin (Wildcard): The multicolor Twin can merge with ANY Twin. It is consumed and upgrades the other Twin by one step.

Stone/Rock Twin: Rocks do not merge. They only disappear if hit by a multicolor Twin (wildcard). The wildcard is consumed too.

Examples:
+ → (next evolution)
+ → (next evolution)
+ → (wildcard upgrades by one step)
+ → both disappear (rock breaks)

Game Over: If the pile reaches the danger line near the top for too long, the game ends.