Colored XOR CMY XOR stamps

Goal: make Your board match the Target exactly (shape and color). You place tetromino stamps. 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.

Difficulty Grid

Moves

Move limit

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Keyboard (only the essentials; no duplicates):
I O T S Z J L pick a piece • R rotate piece • 1/2/3 choose Cyan/Magenta/Yellow • U undo last stamp • Y redo • H toggle mismatch hints • C check match status.
(No keyboard shortcuts for Reset, New, or Solution to avoid conflicts.)

Pick a piece (I/O/T/S/Z/J/L), pick a color (1/2/3), hover, click to stamp.

Mismatch: — Level: 1 Recipe: —

Target

Moves: 0 / —