If you liked Sudoku or Rubik's Cube, then there's a good chance you will like the Numbrosia Puzzle as well! The goal is to turn all the numbers in a grid into zeros in as few moves as you can. Moves are: add one to or substract one from a row/column; and rotate a row left/right or a column up/down. This puzzle is original, challenging, and highly addictive!
