If you’re a fan of Sudoku but actual mathematics freaks you out, Threes! may be the game for you. To the uninitiated, Threes! may look like a game heavily based in numbers, but really it has more in common with Solitaire than anything else. Overall, it’s a block sliding puzzle game that’s simple to pick up and hard to put down, and it’s down to 79p / 99¢ today, so give it a try for yourself.