Flood Puzzle Online

Flood is one of the classic one-player logic games in Simon Tatham's Portable Puzzle Collection. Turn the grid the same colour in as few flood fills as possible.

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Preparing the game board and controls.

Game Objective

Make the whole grid one color before you run out of moves. You control the connected area that starts in the top-left corner, and each move changes that area to a new color so it can absorb matching neighboring squares.

Turn the grid the same colour in as few flood fills as possible.

How to Play

Click any square with the color you want next.
The top-left connected area changes to that color; any touching squares of the same color immediately join your area.
These puzzles reward careful deduction more than speed. Start with the most constrained clues, eliminate impossible choices step by step, and avoid guessing unless the puzzle specifically calls for it.

Beginner Tips

Watch the area connected to the top-left corner. That is the only area you are expanding.
Choose colors that connect your area to large neighboring groups, not isolated single squares.
Look one move ahead: a small color change can be good if it sets up a much bigger merge next.