Every now and then slot players have a chance to play a completely unique slot game. Sudoku is a special online slot game created by Amaya. So, we are talking about an original game that comes with 9 reels and 9 paylines, but this is not a typical slot matrix. The main objective is to fill a square with numbers from 1 to 9. This unusual slot has two bonuses. Landing at least five completed squares will trigger 15 Free Spins where the wins are multiplied by two. On the other hand, if you get at least seven red numbers on the matrix, you will get 5 re-spins where the red numbers are kept in place. The star symbol acts as a classic wild symbol which replaces regular symbols as long as it can help you build a winning combo.