El King:
On level 5, probably the level to waste el king, I use lead oxide. What I do first is let el king soften himself up on all the hazards on the track while I attack the smaller cars. At the end, I just guard the hoop and wait for him. When he comes, I attack him head n. then I run to the hoop. When I return I do whatever I can to block him from repairing. I also take advantage of my turning power.
You should eventually come to a “death spiral”. This is where 2 cars keep turning around in a circle trying to hit each other. You can either stay in the circle or leave. I usually stay and wait for him to run. Then, I use my speed to catch up to him and pound him. One more thing, if you can get him to the edge of the map, just keep hitting him before he can turn.
Dr. Monstaa:
He is a lot harder. He is like el king on steroids. On level 9, just use radical one to race. I usually use el king on level 10 to attack him. First, wait for him to hit something that makes him stop. Then slam into him, don't hold back. Whatever you do, don't get in the death spiral - you will lose. Just stay by the hoop and hope for the best. If he is down, pound him. Everything else, your on your own.
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