HexFlood fills the screen with a honeycomb grid of coloured hexagons. You control a blob that starts at the top-left hex. Tap any colour from the row of buttons at the bottom and your blob instantly floods outward, absorbing every neighbouring hex of that colour and adding it to your territory. Those newly absorbed hexes then extend the border of your blob, potentially capturing even more cells of the next colour you pick. The goal is to make the entire grid one single colour. Every tap counts — the fewer taps you use to flood the whole board, the higher your score. Beating the par number of taps earns bonus points. As you progress through levels the grid introduces more colours, making it harder to plan efficient sweeps that capture large sections in a single move.