lose 500 'lives' means to lose 500 health. so just hang around a base, killing newly spawned enemies for heath and let them damage you, then repeat til 500 health is lost for that level
that's because there aren't any glitches. freeer2, venturakid94, and astrozombi are just dumbasses. they think there are only five possible differences for each level. when the game switches up the differences on them they give up and call it a glitch
i hope people realize that there are MORE than five possible differences in each level. i hate it when people assume there's only five and then they restart the game and find that its changed. and then the go "OMG one of the difference are not there! so this thing must be glichy! 1 star!"
Brek: the exception to that is the third level and the second to last level. i think those two on the only ones with ONLY five differences. the rest have more