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.
What This Game Is
Flood is a self-contained logic puzzle built around one clear objective. Each new board gives you a fresh problem to solve, so it works well for quick sessions and repeated play.
Turn the grid the same colour in as few flood fills as possible.
How to Play
To play Flood, click the mouse in a square. The top left corner and everything connected to it will be flood-filled with the colour of the square you clicked. Clicking a square the same colour as the top left corner has no effect, and therefore does not count as a move. You can also use the cursor keys to move a cursor (outline black square) around the grid. Pressing the return key will fill the top left corner in the colour of the square under the cursor.
Most puzzles in this collection reward deduction more than speed. Focus on the most limited choices first, use the clues to narrow the board, and avoid guesses unless the puzzle mode clearly expects them.
Beginner Tips
- Start with the area that has the strongest clue or the fewest legal options.
- Use marks, notes, or temporary indicators if the puzzle supports them.
- Try to preserve flexibility instead of committing too early when multiple moves look possible.
- If the board gets messy, restart a fresh puzzle and apply what you learned from the first run.
Official Reference
If you want the full original rule explanation, examples, and advanced options, the official manual is the best reference.
Read the official manualFrequently Asked Questions
More Logic Collection Games
Galaxies
Divide the grid into rotationally symmetric regions each centred on a dot.
Guess
Guess the hidden combination of colours.
Inertia
Collect all the gems without running into any of the mines.
Keen
Complete the latin square in accordance with the arithmetic clues.
Light Up
Place bulbs to light up all the squares.
Loopy
Draw a single closed loop, given clues about number of adjacent edges.
Magnets
Place magnets to satisfy the clues and avoid like poles touching.
Map
Colour the map so that adjacent regions are never the same colour.