This basic contraption will launch your Lego mini figure away and it is very easy
Step 1: Step 1
First you make a small hill with a bench on it,(make sure the bench piece have holes in them)also make the hill 12 to 16 bricks high
Step 2: Step 2
Then you get a key piece (size does not matter) and put it in the hole in the bench
Step 3: Step 3
Then you make a small hole in your hill and then you get a 2 by anything and use that to push the mini figure up and send him flying.I hope you liked my basic launcher.