A quick 4×4 Sudoku! Fill the grid so every row, column and 2×2 box has 1-4.
Click a cell to cycle numbers 1-4. Fill so each row, column, and 2×2 box contains 1-4 exactly once.
Click : Cycle number 1-4
Click a cell to cycle 1-4.
Wrong numbers turn red.
Yes — every puzzle has a solution!
