I found this code on a lot of sites and here it is
Map Pack Zombie Hack [SC7E52]
28200FA0 00000004
054CE1B8 5B9FDF43
054CE228 5B9FDF43
054CE298 5B9FDF43
054D2F28 01000000
054D2F98 01000000
054D3008 5B9FDF43
054D3078 5B9FDF43
054D30E8 5B9FDF43
054D3158 5B9FDF43
E0000000 80008000
did it says to press down on wii remote when going to zombies, it hasnt worked for me.
Map Pack Zombie Hack [SC7E52]
28200FA0 00000004
054CE1B8 5B9FDF43
054CE228 5B9FDF43
054CE298 5B9FDF43
054D2F28 01000000
054D2F98 01000000
054D3008 5B9FDF43
054D3078 5B9FDF43
054D30E8 5B9FDF43
054D3158 5B9FDF43
E0000000 80008000
did it says to press down on wii remote when going to zombies, it hasnt worked for me.