Anyone here remembers that Bayonetta minigame that Platinum made a while ago on their website? Well, it's on Steam now as 8-bit Bayonetta, out of nowhere, and it even has achievements =P
Early April Fools joke? Who knows, but it looks like the real deal could be coming to Steam as well, seeing as one of the achievements leads to a web page with a timer:
Original thread (From NeoGAF): http://www.neogaf.com/forum/showthread.php?t=1357085