The following can be purchased from the [Special Features] menu.

Points - Effect

10 Intel Points - Art: Part I
10 Intel Points - Art: Part II
10 Intel Points - Art: Part III
10 Intel Points - Art: Part IV
650 Intel Points - Cheat: Increased Force
900 Intel Points - Cheat: Invisibility
600 Intel Points - Cheat: One Hit Kills
550 Intel Points - Cheat: Unlimited Ammo
550 Intel Points - Cheat: Unlimited Items