The story behind the stack.

Origin

4D Rhombus Chess began as a sketchbook puzzle in 2023 — what would chess feel like if every move could leave the plane? The first prototype ran on paper across seven hand-cut rhombuses, with bishops the first piece to feel genuinely terrifying.

Three years and 14,000 test matches later, the game ships with two formats, a five-tier AI, and a rule set that fits on a single page — yet rewires every chess instinct you have.

Philosophy

Don't reinvent chess. Extend it. Every rule in Rhombus collapses cleanly back to standard chess if you delete the level axis — which means the learning curve is "10 minutes to play, 10 years to master."