Trine

“Trine is a physics-based action game where three characters allow clever solutions to challenges created by hazardous puzzles and threatening enemies. The gameplay is based on fully interactive physics - each character's different abilities and tactics can be used to invent new ways to overcome obstacles and save the kingdom!”

The game was developed by Frozenbyte, who previously worked on the Shadowground series. Trine was a huge success on Steam, even with its high GPU requirements.