Koopa finally got a hold of Mario and realized that in order to finally stop him he needs to rid him from what he uses the most: his legs to jump over his enemies. So Koopa eats Mario's legs and leaves him to bleed to death.
Princess Peach, now impregnated with the seed of Koopa, will give birth to the AntiChrist so Mario, realizing Luigi is too much of a pussy to save the world by himself, realizes that "death can kind of wait" given the present circumstances so he pushes forward, dragging his body through the floor and killing his enemies by eating his heads instead of jumping on them.
Instead of coins, Mario now collects "Blood Pints" to keep himself from bleeding to death and, when in possession of +100 points in Blood Pints he can unleash a powerful blood-whirlpool attack that shall be dubbed the Menstrual Madness.
Nintendo is selling their IPs to Microsoft and this is true because:
http://gamrconnect.vgchartz.com/thread.php?id=221391&page=1
