The square is the main protagonist of the World's Hardest Game series. Its rivals are the circles.
- It was not revealed to be a sentient character until TWHG3.
- In TWHG1, it is always red. In TWHG2, the player can change its color from the menu. In TWHG3 & TWHG4, it starts out red and the player can unlock the colors throughout the game.