Topic: GemCraft chapter 0 / how do you make a supergem in gemcraft 0?
Though for a level itself, farming is for the score (and consequently exp). One of the reasons you get an additional mode to play with at lvl 8, 16 and so on — makes it much easier to power level and have more of an edge later on. (also sry for double post, I should really read previous posts before jumping in. ^^;)