FOUR is a game in which four shapes in four colours are placed in a virtual grid according to four constraints. It includes 32 tiles in 4 colours and 4 shapes and a cotton case. The base square is 2 cm per side. There are two editions available:

- Acrylic edition: cotton case, 32 laser-cut acrylic tiles. They're 3mm thick, shiny, heavy and clacky.
- Foam edition: cotton case, 32 foam tiles. They're 5mm thick, light, soft and flexible.