Everything Unlocked (Note: This requires a game pad.) - At the Title Screen, Hold Button 5 + Button 6 + Button 7 + Button 8 + D-pad Up/Left + Left Analog-stick Down/Right until "Devil May Cry" is heard. This will unlock all bonus modes, alternate costumes, and gallery entries.

Gallery Items - Complete the game to unlock gallery mode. Then complete either the missions or game under the following difficulty to unlock the following gallery items.

Bonus Art 1 Get an "S" rank on all missions in Dante Must Die!.
Bonus Art 10 Get an "S" rank on all missions in Dante Must Die!.
Bonus Art 11 Get an "SS" rank on all missions in Easy.
Bonus Art 12 Get an "SS" rank on all missions in Normal.
Bonus Art 13 Get an "SS" rank on all missions in Hard.
Bonus Art 14 Get an "SS" rank on all missions in Very Hard.
Bonus Art 15 Get an "SS" rank on all missions in Dante Must Die!.
Bonus Art 2 Complete the game on Normal.
Bonus Art 3 Complete the game on Hard.
Bonus Art 4 Complete the game on Very Hard.
Bonus Art 5 Complete the game on Dante Must Die!.
Bonus Art 6 Obtain an "S" rank on all missions in Easy.
Bonus Art 7 Obtain an "S" rank on all missions in Normal.
Bonus Art 8 Obtain an "S" rank on all missions in Hard.
Bonus Art 9 Obtain an "S" rank on all missions in Very Hard.

Unlockable difficulty levels

Dante Must Die Complete the game as Dante or Vergil under the hard difficulty setting.

Easy Complete the game under the normal difficulty setting.

Hard Complete the game under the normal difficulty setting.

Very hard Complete the game under the hard difficulty setting.