What is the fastest way to level up in MechQuest?

I usually do the order 66 thing or the giant spider at the university.

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Hazza73 here, the easiest way to level up is by turning scale fights in assault mecha off, and typing in 10708710. it gives you some amount of exp between 200-300. if you're a star captain you can put Xtreme difficulty on and get about 440 exp. hope this helps!