Your goal is to push and merge the numbered blocks until only one block remains.

Swipe to move the yellow block. Push the numbered blocks into others with the same value. When two or more numbered blocks with the same value touch, they will merge into one block with double the value. If you make a mistake, press the blue arrow button to undo or the yellow arrow button to restart. 

TIP: The block that remains after a merge will be the block you pushed. Use this to your advantage as you plan your moves.