Recursudoku

Ever wanted to play Sudoku but found it too predictable? In Recursudoku, empty cells can hide entire Sudoku puzzles. Solve those inner boards to reveal numbers needed in the puzzle above. Keep diving deeper, uncovering clues, and working your way back up until the main board is complete. With up to 10 nested layers of puzzles, Recursudoku adds a new twist to the classic Sudoku formula.