Play solo or against the computer

BlockOrChain

486 triangular spaces, 22 polyiamond blocks each. Chain outward corner-to-corner, never edge-to-edge, and box your rivals out of the grid.

Mode

Computer difficulty

Plays big pieces first and keeps its options open.

Corner chaining

Every block must touch your colour at a corner — sharing an edge is illegal.

From loose and hoarding to ruthless, deterministic sealing play.

Blue & Red co-operate against Yellow & Green, teammates opposite each other.