Flood

Flood is a grid-based puzzle game. Each square starts in one of several randomly assigned colours. On each move, you choose a colour for the top-left square; all same-coloured squares connected to it by orthogonal paths are filled with that colour, expanding the area connected to the starting square.

Your goal is to make the entire grid one colour within the move limit. The game sets that limit using its internal solver, and you win by completing the grid in that many moves or fewer.