@HAALOFAN9000: All mice must get cheese in order to get map 777. That is why it is more common with fewer mice. Also, you must have at least 11 mice in the room, and at least all of them must make it. More mice, more can mess up. Your "analysis" was correct, but you only scratched the surface. Hopes this helps. + so people can see and stop wondering.
Person 1: Hey man, did you just see that giant teddy-bear vaprize a house AND helicopter?
Person 2: Yeah, man. I saw it from the beginning. Just think, it all started with a seed.
Elf: Santa! We forgot to get your sleigh ready! Santa: It's okay! Just shoot me out of a cannon and throw grenades at me! They must get their presents!