You must play on one mobile device. In his turn player collect gems, build tower, and destroy tower of opponent. If you create tower of 50 size high you also win.
Gray gems - build tower
Green gems - build wall
Red gems - fire atack
Blue gems - lightning atack
Purple gems - each 10 elements give 1 magic power
Red gems first atack enemy wall. Lightning damage evenly to the wall and tower.
If you collect 4, 5 or more gems in your turn it gives more effect. The magic powers increases this effect.