I was thinking there can be some sort of barrel race. You need to throw barrels to finish the race. But you would need it so when you throw barrels it can't hurt anyone and no goo will come from it. And when you throw a barrel the explosion shouldn't blow up any other barrels.
The first level I made is just everyone going on one track. (Note: It's just an example I will make it longer if needed)
The second is everyone gets their own row. First one to finish wins. I just did a couple of rows to give an example of what my idea is, it would be much larger if created. Same thing goes though, barrels' explosions don't cause other barrels to explode and no goo. It's all just throwing barrels to clear the path.
Tell me what you guys think.