I recently bought this game, and it is AWSOME! but I'm stuck on the 6th actual chalenge, Ambush Grove. At the last part, when you hit the checkpoint, and it turns into lava-land with the 4 cannons and 3 lava-shooters rockies. I can't figure out what to do, because the only thing you can shoot at that does anything is the rockies, and then they respawn before you can kill the 3rd one! as if the lava shooting out of teh ground wasn't enough....

I'll gave anyone who helps me with this $100(not really, but a nice bribe, huh?)

ok....I finally got there...it is the 9th challenge not the 6th....what you have to do is kill all three, they all must be dead at the same time to get the platform to rise....what I did was shoot the one on the lava below the cannons first...when he respawns it is on the platform with the other two...then keep switching cannons and blasting away...eventually you will get ahead of them respawning, first down to two then the final one....good luck!!

Actually, they have a set number for the amount of times they respawn.

just keep shooting but i did it with two players me and my bro his name is clubster on neoseeker