Remove two equal numbers or two numbers that add up to ten. Valid pairs may sit next to each other or connect horizontally and vertically across empty cells.

When a row is cleared, the rows below move upward. A board is complete when every number has been removed. There is no timer, so a board can be left and continued later.

The first campaign boards introduce the rules step by step. Later worlds use generated layouts and modifiers, while the daily board gives every player the same puzzle for that date.