what do you guys do until 21?
Before Changelog 15/04/2010?
Crafting needler cartriges, outdoorsman, insta-kill on muties, centaurs and floaters. Hunting on Endless Walker in real time (you'll always meet them near Glow, with mantises most of time).
After Changelog 15/04/2010?
Craft desert eagle, .44 ammo, go on molerats or molerats vs molerats or molerat, molerats and molerats encounters. 1 shot = 1 kill = 120 XP.
Yes, it's for non-fast shot SG user.