Threes is a puzzle game where you slide numbered tiles on a grid. When they collide they combine their numbers, like Triple Town. You can match 1's and 2's with each other, the white tiles can match cards that are multiples of 3 with each other (6, 12, 24 and so on). As more tiles are added to the grid, the aim is to keep moving the tiles around to avoid becoming locked where there are no more merges available.

When you complete a game you receive a final score based on the rarity of the tiles you have created (rather than the tile number values). There are 12 kinds of number tiles in the game with values from 3 through 6,144. Each of them has different properties (and characters) and are unlocked as you progress.

The result is a simple puzzle game with lovely characters and a considerable challenge for those who want to score highly.