Put at least 3 gems in a same type in a row horizontally, vertically or diagonally to get the points and win the game. In each level, you are asked to complete some amount of gems to complete the level.
For instance in Level 1, you are asked to destroy 6 gems in total no matter what their types are orientations are.
However in level 13, you will have to complete 9 Left-Diagonal pattern to complete the game like following
X
--X
----X
Gem Block has similar game play as "Tetris" and "Candy" like games. So, we believe that you will be directly adapt the controllers and enjoy this game.