The following are known Action Replay Codes for Confidential Mission on SEGA Dreamcast (Dreamcast). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

Inf Continues
6C0B6A0D
00000008

Constant 10 Bullets No Reload
B7763BB2
0000000A

Inf Lives
94F80BD5
00000005

Monster Score
FEA9950F
0000FFFF
317927CE
00000FFF