Onslaught
Unlockables
Extra difficulties
In addition to the three difficulty settings available from the start, there are two unlockable difficulty settings.
| Unlockable | How to Unlock |
|---|---|
| Finish the game on Hard difficulty | Expert difficulty |
| Finish the game on Expert difficulty | Ultra difficulty |
Contributed By: fabfabfabed.
Upgrade locations
Each weapon (including grenades and the whip) has 2 upgrades that count as additional weapons. The upgrades carry over even if you start a new game on another difficulty (on the same save spot).
| Unlockable | How to Unlock |
|---|---|
| Box in Mission 5 | 2nd level Assault Rifle |
| Clear Missions 1, 2 and 3 in Normal difficulty (S rank) | 2nd level Grenades |
| Clear Missions 9, 10 and 11 in Normal difficulty (S rank) | 2nd level Rocket Launcher |
| Box in Mission 11 | 2nd level Shotgun |
| Box in Mission 3 | 2nd level SMG |
| Clear Missions 5, 6 and 7 in Normal difficulty (S rank) | 2nd level Whip |
| Beat the game in Ultra difficulty | 3rd level Assault Rifle |
| Clear Missions from 1 to 8 in Hard difficulty (S rank) | 3rd level Grenades |
| Clear Missions from 1 to 12 in Ultra difficulty (S rank) | 3rd level Rocket Launcher |
| Beat the game in Expert difficulty | 3rd level Shotgun |
| Beat the game in Hard difficulty | 3rd level SMG |
| Clear Missions from 1 to 8 in Expert difficulty (S rank) | 3rd level Whip |
Contributed By: BiigLord.
