Goblins app for iPhone and iPad

From Phillip Reeves Goblins how you can play Goblins: Bratapult Wars.
Goblins: Bratapult Wars – Can you survive a Goblin invasion?
To mark the launch of Phillip Reeve’s latest book – GOBLINS – we have created the green and mean Goblins: Bratapult Wars. As wave after wave of marauding, looting Goblins try to break into your Clovenstone fortress to steal what they can, only you can hold them back by firing rocks, axes and fireballs from your mighty Bratapult!
Keep a steady aim and a cool head for as long as you can because if enough of these Blackspike Boy brutes get through then that’s it! Finshed! Kaput! Your Bratapult will be in bits and your treasure will be gone! Good luck…