The goal is to turn all the numbers in a 5x5 grid to zeros in as few moves as you can.
There are two kinds of moves: rotation moves and math moves.
Rotation moves allow you to rotate a row left/right or a column up/down while
math moves allow you to add one to a row/column or subtract one from a row/column.
Your score for a given puzzle is determined from the number of moves you used to solve it. Specifically, the score is calculated by dividing the world record move count by your personal best move count for that puzzle.
If you tie or beat the world record, a perfect score of 100% will be given for that puzzle.
Numbrosia comes with 1000 puzzles that you can redo over and over again to improve your scores.
Numbrosia 2 is like Numbrosia except that rotation and math moves operate on maximal row/column segments of length 2-5 that do not include any unnumbered blocks.
Numbrosia 3 is like Numbrosia except that rotation and math moves operate on maximal row/column segments of length 2-5 that contain at least one nonzero and where all nonzeros have the same tile color -- namely, all white or all yellow. Zeros always have a black tile color.