DuoDom

Drag a stone next to another one. Do the two touching sides show the same number — or does one side match the other stone's total? Then both dissolve. Clear the board and the level is yours. The first levels are small and go by quickly. Later the board grows, the clock gets tighter, and from level three on a fuse starts burning somewhere. Every ten levels the stones look different, and there is no last level — each one is made fresh, and every one of them can be won. Stuck, or running out of time? Take a move back, ask for a pair, put out a fuse with water or buy ten more seconds — paid for with the points you have collected. And if you would rather watch, let the game clear the level for you.