It’s a simple yet challenging free block puzzle you won’t be able to put down. Merge cube blocks on the 9x9 grid, which should be familiar to all sudoku fans, to build lines and squares. Strategically stack sudoku blocks made up of cubes on the board to destroy them and keep the board clean. block puzzle, free puzzle game, sudoku puzzle, merge puzzle, block game, brain training, puzzle game, mobile game, addictive puzzle, strategic puzzle, 9x9 puzzle, block stacking, high score, puzzle game online, brain exercise, casual game, free to play, puzzle game for mobile