Filler (aka 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.
Starting positions:
Player 1 starts in the bottom left corner of the field;
Player 2 starts in the upper right corner of the field.

Filler Classic has two game modes:
- multiplayer, i.e. human vs. human (same device or the Internet)
- human vs. AI (with four difficulty levels)

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