How to play Two Tone
Fill every square with one of two symbols, obeying three rules.
These are the rules for the PlayBurst version. Other versions may play differently.
Rules and controls
1. Place a symbol
Tap an empty square to cycle it through the two symbols and back to empty. The squares that start filled are the puzzle and cannot be changed.
2. Never three in a row
No three of the same symbol may sit next to each other, across or down.
3. Half and half
Every row and every column ends up holding three of each symbol.
4. No repeats
When the board is full, no two rows may be identical, and no two columns either.