Cursor*10 is an amazing little doujin flash game that asks “Cooperate by oneself?!” You have 10 little cursors and you have to make it up to the 16th floor. I’ve made it to the top and my high score is 183. I think that’s pretty good (i.e. I know you can beat me)!
By the creators of the Xananeko games.
(Thanks, arrowhen! Via Sensible Erection [NSFW].)