Tricky Software has announced the release of Emma and the Inventor for the iPad. It’s a free download, though unlocking the full game requires a $4.99 in-app purchase.

Emma’s Grandfather Jenkins has completed his greatest invention ever, but the mysterious machine has transported him to an alternate dimension shortly before exploding, scattering its pieces all over his home. Emma must put the machine back together again, then create fuel for it, to get her grandfather back from beyond.

Emma and the Inventor is a “hidden object”-style puzzle adventure game that was originally released for Mac and Windows earlier this year. The game features more than 40 individual screens, dozens of environmental puzzles and achievements that you can unlock and share with your friends using Game Center.

Tricky Software, the game’s original developer, has created an iPad version of the game with gameplay and controls optimized for the iPad. Emma and the Inventor requires iOS 4.0 or later.