Dark Rift 64
Play as Sonark Nezom

At the title press Left, Right, C-Up, C-Down, C-Left, C-Right. You will hear a beep to confirm it.

Play as the Bosses
 
At the title screen press A, B, R, L, C-Down, C-Up.
See each character's end screen

 Enter codes at title screen:

Aaron: press Up, Left C, R, Right, Down, R, R, Left C.
Demonica: press Up, Left C, R, Right, Down, R, R, Up C.
Demitron (boss): press Up, Left C, R, Right, Down, L, L, Down C.
Eve: press Up, Left C, R, Right, Down, R, R, Right C.
Gore: press Up, Left C, R, Right, Down, R, R, Down C.
Morphix: press Up, Left C, R, Right, Down, R, R, B.
Nikki: press Up, Left C, R, Right, Down, R, R, A.
Scarlet: press Up, Left C, R, Right, Down, L, L, Left C.
Sonark (boss): press Up, Left C, R, Right, Down, L, L, Up C.
Zenmuron: press Up, Left C, R, Right, Down, L, L, Right C.

 
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