Flood It looks like the simplest game we host: a 14x14 grid of six colors, a row of swatch buttons, and a goal a toddler could state, make the whole board one color. Then you try to do it in few enough moves, discover that the greedy obvious choice is reliably wrong, and learn why computer scientists proved this cheerful little puzzle is NP-hard. It earned its review.
How it plays
You control the territory growing from the top-left corner. Tap a color and your whole territory becomes that color, absorbing every neighboring cell that matches. That is the entire interface, no dragging, no timing, just a sequence of color choices, which makes it one of the most naturally mobile-friendly games in the library. The score is your move count against your saved best, and the gap between a sloppy solve and a sharp one on the same board runs five moves or more.
What works
The depth-to-interface ratio might be the best on the site. Every tap is a genuine decision, grab the most cells now, or the color that connects you to the board's biggest future regions, and learning to see connectivity rather than count is a real skill with a real curve. Boards are fully visible from move one, so there is no luck after the deal, and the twenty-something-move rhythm of a good solve fits perfectly in a coffee break. It is also the rare puzzle that teaches graph thinking without ever using the word.
What does not
Six flat colors on a grid is as plain as game presentation gets, Flood It's beauty is entirely internal. There is no campaign or difficulty ladder, just fresh random boards and your own move count, which suits self-motivated puzzle people and starves reward-driven ones. And colorblind players should note the game leans fully on hue, the swatch buttons help, but some palettes work harder than others.
My verdict
The best five-minute strategy hit in the library and my default recommendation for 'something to think about in a queue'. Chase a sub-25 solve and you will understand the whole appeal. The connectivity mindset that gets you there lives in our fewest-moves guide.
Play Flood It free →Pros
- Real strategic depth under one-tap controls
- No luck after the deal, fully visible board
- Perfect coffee-break session length
- Best-move-count chase is quietly addictive
Cons
- Visually plain by design
- No levels or progression, pure self-motivation
- Hue-reliant, tougher for colorblind players
FAQ
What is a good move count in Flood It?
On the 14x14 six-color board, solid play lands in the low-to-mid twenties, and your best count is saved locally. Perfect play is a provably hard optimization problem, so there is effectively always a move to shave.
Why is picking the biggest color grab often wrong?
Because connectivity beats quantity: the color that adds most cells now may wall you off from the board's largest regions, costing extra moves later. Strong play aims each pick at linking up future territory.
Is Flood It really NP-hard?
Yes, finding the optimal flood sequence on boards with three or more colors has been proven NP-hard, meaning no known efficient algorithm guarantees perfect play. Your intuition is competing with a genuinely deep problem.