Filler Classic, also known as 7 Colors, is a popular puzzle game available on Android devices. The game involves playing against a human or computer opponent on a field with color squares. The objective is to occupy as many squares as possible by selecting elements of a chosen color that are adjacent to already occupied squares. However, the current color of the opponent cannot be selected.

The game has two modes: multiplayer, where players can play against each other on the same device or over the internet, and human vs. AI, with four difficulty levels. In the multiplayer mode, Player 1 starts in the bottom left corner of the field, while Player 2 starts in the upper right corner of the field. Filler Classic is a great way to challenge your mind and have fun while doing it.