What engine did SMG used? Why don't Nintendo use it in SSBB & MK Wii?

[Viper1]

Gosh said:
It was so good in graphics and physics, & what engine is that? Havok? Unreal 3? Rage? Crytek?id Tech 5? SMG 128? They should release it to other developer instead of letting them making crap games!

It was all in house tools.  Meaning Nintendo build it all specifically for SMG and didn't use 3rd party tool sets.

I doubt they'd package it for 3rd parties either because it is so specific to that game that it would actually be detrimental to other games.