Fillup is a turn-based chain-reaction strategy game. Place directional slices into empty cells or cells you control. Each cell has a capacity based on its position: corners hold 2 slices, edges hold 3, and central cells hold 4. When a cell becomes full, it bursts into neighboring cells, captures them, and may trigger a larger cascade. Complete the displayed objective or eliminate the opposing color to win.

The game includes a solo Campaign, online matches, and local play. This playtest focuses on the tutorial, first-time experience, and core mechanics.

Open https://fillup.fun/play-now in a current desktop version of Chrome, Edge, Firefox, or Safari. No installation is required. Select Play now to continue as a guest without creating an account or providing an email address. You must be at least 16 years old.

Follow the guided practice provided by the game. Please do not read the separate Rules page before completing it, because part of the test is discovering whether the game teaches itself effectively.