Have you guys tried going to EXO's official website?

you see there's this different version of their websites

http://exo-k.smtown.com/Intro

http://exo-m.smtown.com/Intro

when you click the links above

the version you went to is WOLF

try clicking the word "NEWS/NOTICE"

a pop-up window will come out

then scroll down and look at the very end right corner :3

click the select version

XD that's alllllllllllllllllllllllllll~~~~~~

oh, and

EXO's MAMA song is playing once you open the MAMA version :3

though it's a teaser version XDDD