GemStone Challenge credits :

- Design, Graphics and programming by Julien Wyart

- Powered by cocos2d Application framework for iphone (

- Music : Arcade Music Loop by MartynHarvey, Starian by MusicShake (bought on

- Jungle Fever Font from

- Graphic Textures from the Genetica Texture Packs (

- Thanks to my wife Gwenaël 

- Thanks to ray wenderlich ( for his helpful tutorials