Enter arcade mode. When the best record appears, press Right, Left, Right, Left, X + Y. Mask should be now be unlocked. Alternately, clear legend mode with all hidden characters.
Win five consecutive matches to unlock the following fighters, in order. The next fighter in line will be unlocked with your next streak of five wins.
1. Robbie Lawler 2. Tsuyoshi Kosaka 3. Vitor Belfort 4. Pat Miletich 5. John Lewis 6. Dan Severn 7. Jeremy Horn 8. Hayato Sakurai 9. Maurice Smith 10. Mark Coleman 11. Mikey Burnett 12. Bas Rutten 13. Gary Goodridge 14. Frank Shamrock 15. Marco Ruas
Win 33 consecutive matches in arcade mode.
Lose 66 bouts in arcade mode.
Clear legend mode with all normal characters.
Win the silver belt with all characters in championship mode to unlock Big John McCarthy.
Win the silver belt with all characters except one in championship mode to unlock Larry Landless.
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