Farming maps (imo, and on all diffs) include: for easy maps, try Goldmine, Cake, Creeper. For medium maps, try FreeWilly, MushroomLand. Hard maps, Halloween, BalrogsHead. Expert maps, do GoldMinePK, OceanWaves, Random, ShatteredWorld, ZenaniTower. For insane maps, try TestFacility, Park, Cage...