Filler (aka Flood-It or 7 Colors) is a well-known puzzle game. You play against a human or computer opponent on a field with color squares. Your goal is to occupy as many squares as possible. Elements of the selected color are occupied if they are adjacent (have common edge) to the already occupied squares. But you cannot select the current color of your opponent.

Filler Classic has two game modes:

• multiplayer, i.e. human vs. human (on the same device or via the Internet)
• human vs. AI (with four difficulty levels)