You can touch blocks to rotate them, or drag them left and right if there's space available. When you make a solid connection from the left to the right hand side of the board, the connected blocks explode.
As in Tetris or other similar falling block puzzle games, if the blocks pile up faster than you can blow them up, you lose!
Shock Lite is fully-featured, but only includes the first several levels. For a more challenging game experience, purchase the full version of Shock for $1.99!