Disks [xx/10] Incredible Machine 3 Incredible Machine 3 is the third installment in Sierra On-Line's critically acclaimed software series. Construct cause-and-effect contraptions with working pulleys, levers, conveyor belts, motors, balloons, and more. In addition, you can construct over 150 machines that create specified effects; or play in the 'free-form' mode to build your own puzzles from a variety of active parts and background items. Once you've perfected your inventor skills, you can put them to the test against another player in the 'head to head' mode.