To complete the level you must stack a pile of gems that are worth your target dollars. Every dollar over the target, at the end of the level you get as a bonus added to your score.

Pile them on top of each other to reach the height targat at the top.

Take as long as you want, but you only have a limited number of gems to use. The number of blocks you have left at the end of the level gets added as a bonus as well.

* GemStack is controlled via the mouse and keyboard

* Use the mouse to place and move around your gem.

* Click the left button on the mouse to drop/place the gem.

* Use the left or right arrow keys to rotate a gem.

* Press P to pause the game.