Algodoo

A car with one wheel, suspension and a gearbox with scripted transmission. Has six gears + reverse. Uses my latest engine, the Super Smooth C-Engine.

Can easily make it up to 220 m/s in 5th gear, and possibly break the sound barrier in 6th.(if you can get it to hold together in 6th, 6th gear is pretty unstable)

Controls:

A/Z - Gear up/down. Goes R-N-1-2-3-4-5-6
X - Quick Reverse
S - Quick Neutral
Up/Down Arrow Keys - Throttle up/down. Slowly goes back down to idle when reved up.

Can climb up at least a 60 degree slope.

Should work fairly well, except that it sometimes hops around slightly, and sometimes in a higher gear the engine breaks, but it usually fixes itself when you go to a lower gear or neutral.

If you'd like to tinker with the suspension, the orange axle's hinge constant controls the softness or hardness of the suspension, so fool around with that one.

Updates V1.1:
Gear display added