Sipsco. are at war... with each other! Use WAD to move Sips_ and move Sjin with IJL. Sips_ shoots with Q & E, Sjin with U & O. There is also an easter egg to find, but it may take a while.
Thanks to the Yogscast for the images Sips_ & Sjin Also nintendo for the super smash bros theme music And valve for the easter egg and companion cube