Tetromino

A Tetromino is a geometric shape composed of four squares, connected orthogonally. This, like dominoes and pentominoes, is a particular type of polyomino. The corresponding polycube, called a tetracube, is a geometric shape composed of four cubes connected orthogonally.

A popular use of tetrominoes is in the video game Tetris, where they have been called Tetriminos (spelled with an "i" as opposed to the "o" in "tetromino") since 2001.

In A Growing Concern World they are found in Charon's region only, first appearing in Fireball to Tetromino, however they can be eaten in that level. The first level where they can be eaten is Tetras the Day.