On the title screen, press Up, Up, Right, Right, Left, Left, Down, Down
Access Freeplay
On the title screen, press C, R, A, Z, Y, C, Y, R, A, X, then press Up when the kube is on kombat
Lots of Stuff
On the Ultimate Kombat Kode screen, press X (x9), Y (x6), Z (x4), A (x2), B (x4)
Play as Ermac
Select Cyber-Smoke, and press and hold L + HP + B + HK + R
Play as Human Smoke
On the Ultimate Kombat Kode screen, press X (x7), A (x7), B (x2), C (x3)
Play as Mileena
On the character select screen, press X (x7), Y (x6), A (x5), B (x2)
Play as Sub Zero