Batman: Arkham Asylum was one of last year’s surprise hits. Gamers came for the fanfare and stayed for the shockingly varied game play. Needless to say, if you haven’t played Arkham Asylum, you are certainly missing out. Games on-demand service OnLive has a very lucrative offer for the few who don’t yet own this instant classic. From Saturday July 24th to Sunday July 25th, gamers can purchase unlimited play of Batman: Arkham Asylum for an exceptional 50% off. Even sweeter, this is the Game of the Year edition of the title, with bonus missions and unlockables. You will need to enter the code “BATSALE” at the purchase confirmation screen to take advantage of this very limited offer. So if you constitute the small group of gamers who don’t own BM: AA, now’s as good a time as any to join in on the madness.