Unlimited health:
At the 'Extras' menu, enter Y, White, Black, Black, White, Y, Black, Black, Black, Y, Y, Y.

Slayer power:
At the 'Extras' menu, enter Y, Y, Y, Black, Black, Black, Y, White, Black, Black, White, Y.

Multiplayer Arena Mode:
At the 'Extras' menu, enter Y, Y, White, Black, Black, Y, Y, Y, Y, Y, White, Black.

Play as Dark Buffy in Arena mode:
At the 'Extras' menu, enter Black, White, Y, Y, Black, Black, White, Black, Black, White, Black, Black, White, Black, Black, Black, White, White.


Thanks to Revolution readers aron theising and Q3vi1!