The Lost Inca is a logic game in which you control two characters, Mark and Jason. Both characters have different abilities. Mark can throw a rope up or down for him and Jason to climb (press up and space bar to throw the ropes up, down and space bar to throw the ropes down, and C to pick up the ropes). Mark can also build a bridge when you press space bar. Jason can destroy crumbling stone and pick stone with the space bar. Press the X key to toggle between Mark's abilities and Z to switch characters.