What Makes You Tick? is a great looking point and click adventure game created using the Lassie game engine. The game tells the story of a young man named Nathan who has been sent by his university to deliver an important message to a retired professor the mysterious Dr. Coppelius who has been missing for a year. While searching around the professor's last known residence, Nathan discovers that he's not the only person seeking the old man.
What Makes You Tick? is a freeware game (about 30 MB in size) and available for the Windows and Mac platform.
Also, Lassie Adventure Studio has just announced the launch of a sequel “What Makes You Tick? - A Stitch in Time”. The game is still not officially available. A commercial release is expected sometime near the end of this year.