Tl;dr As many others have said, Stick Arena is ultimately my favorite XGen game.
A friend of mine showed me stickarena in 06-07; back when there were hackers everywhere, very few mods (hardly ever saw them), only a couple servers, some guy named stuart.hart in the tutorial, and only one spinner! I was in middle school at the time and i couldn't wait to come home and interact with all sorts of people; pros, noobs, roleplayers, and a lot of nice people: Mostly kids. There were clan members recruiting people all the time. Back then, people had accounts named after their clan, it was mandatory if you were in that particular clan. I was never really one to commit myself to a clan. I enjoyed representing myself, and not a clan.
I also tried hacking like everyone else and it was a lot of fun. This was very early on though. I would name change my name to 'Dude' everytime I logged on.
Man this game has so many memories for me and so many nostalgic qualities. I just absolutley love some of the levels and the style of art. XGen HQ being such a perfect level to me; I remember early on that the thing to do was hammer camp in the bathroom, and i mean everyone did it! The amount of noobs on the game far out weighed the amount of pros at the time, unlike today. Eventually I learned to wall glitch by the hammer and really surpise those noobs! Again, this is pre-ballistic, so the server wouldnt kick you out if you wallglitched.
Eventually i got serious and became really good late 07-09 and would always be playing in flatword and 2d against the pros. I became friends with many pros and noobs alike. I still am personal friends to this day with someone i consider a legend. It's amazing that this game created so many friendships for people. I stopped around 2010 and recently came back for some fun from time to time.
I could go on and on about this game that I'm strongly attached to. I think one reason stick arena did particularly well because it was during the infancy of online multiplayers. There were no smartphones like today. I didnt even have my ps3 yet. These days, the gaming market has become very saturated.
Stick arena was also a great social hub, but unfortunately, many other social platforms have replaced that aspect of it as well.
I truely hope XGen can/will create another multi-player game that has a comparable amount of success to it that Stickarena and boxhead had. The team is certainly creative and talented enough to do so.
And again, big thanks to XGen for creating your fun games. Motherload, SRPG, and defend your castle are awesome games too.