Cheat Codes:
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Bonus options and modes:
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Beat the game on either difficulty to unlock additional options
and mode Beat the Annihilation mode to unlock the HP Scanne
UnlockableHow to Unlock
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Boss Rush, Hero Forever – Beat the game on Normal or Har
HP Scanner – Beat the Annihilation mod
Maps – Beat the game on Normal, Hard or Annihilation to unlock a map for that mod