|Get a Gold Medal for every challenge|
Combo Bar only multiplies points for the missions, but other purchased cheats (infinite thermal detonators, rockets, mini-gun, force push, invincibility, and extra damage) will work in challenges. You can replay a challenge over and over to get a better medal if need be, and you get the points from every attempt you make. To make it even easier, have a second player join but not do anything, thus giving yourself even more points. Location of all 47 challenges can be found here.
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