Okay, so there's this physics game called
Fantastic Contraption. It's really addictive.
I have solved the first 18 levels. Yes, I am a geek. I am particularly proud of my Tube solution. The Down Under level is mostly just annoying. Once you know what to do, it's tons of fine tuning till it works. My Mole and Noselifter designs are very similar. I thought the Full Up level was a bit disappointing. I ignored the ball and the hole entirely, and just repeated my Mind the Gap solution. I should try to solve it the way they seem to want (push the ball into the hole and cross after).
I'm still working on the final levels, which are much harder than Handling and Tube.
Theoretically, these links show off my designs.
Zen for Rolling Away
Choo Choo for Reach Up
Bridger for Mind the Gap
Tank for Junkyard
Bulldozer for The Wall
Move It! for On a Roll
Caterpillar for Full-Up
Conveyor Lift for Higher
Flippercar for Around the Bend
Offroad for Up the Hump
Trebuchet for Mission to Mars
Salmon Spawn for Up the Stairs
Noselifter for Big Ball
Intestine for Four Balls
Swinger for Down Under
Mole for Awash
Rotator for Handling
Wiggler for Tube