I spent 9/25/10 playing thing thing arena 3 and getting as many achievements as i could. I got at least 8. My personal favorite weapon on thing thing arena 3 has to be the dual berretas and the TARVO 21 which both tie for first. the berretas a good for being a fallback weapon as well as an offensive weapon. I do suggest if your using them offensively then you move around allot. Trying to sit in a corner and pick people off as they appear if not a good idea. It may work for a little while but eventually you will get overrun or a person with a pankor jackhammer will come along. The TARVO 21 i like because it is an all around good offensive and defensive weapon. With it you can sit in a corner and wait for people to appear.