The key reason that I've found it so compelling is that because it's physics based, the tiniest of changes to your contraption can yeild surprisingly different results. Also, the engine is complex enough that you can balance, swing, counterwieght and winch to your hearts content.
In a stroke of genius, if you register you can also save your best contraptions to share with the world. Here's a few of mine to get you thinking:
Tips for beginners:
- Remember you can move the red piece, and even use it as a wheel
- Momentum is your friend
- You can make chains of wood/water
What are you waiting for? Get playing!