Goal: make Your board match the Target exactly (shape and color). You place four-cell tetrahex stamps on an axial hex grid.
Stamping uses XOR (toggle): stamping the same CMY color on a cell twice cancels it back.
Color = 3-bit CMY state per cell. Each cell stores three on/off bits: Cyan (C), Magenta (M), Yellow (Y).
A stamp flips exactly one bit (C or M or Y) over its footprint.
- One bit on: pure C/M/Y
- Two bits on: mix (C+M, C+Y, M+Y)
- Three bits on (C+M+Y): shown as dark/black
- Zero bits: empty/paper
Overlaps matter because XOR flips bits: if a cell already has Cyan and you stamp Cyan again, Cyan turns off.
Pieces rotate in 60° steps; reflections are never generated by rotation, so handed mirror pieces remain distinct.