KrazzyMatrix is an interesting number puzzle that comes with multiple levels. The game contains a matrix filled with number cells and one empty cell.
You have to move the numbers in ascending order using the empty cell. When all your numbers are in order the game will end.
The game will also calculate total number of moves you performed to arrange the cells. The more the moves the less the score and the less the moves the more the scores.
To unlock the next level you have to successfully complete the current level.
There are many names for this puzzle. Check wiki page for more about on N-Puzzle