The following are known Action Replay Codes for Silent Scope 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

(M)
EC8D4A7C
1456E79B

Stop Timer
4CBCD476
1456E7D7

Have Max Score
1024165C
0000E0FF
48E21F04
000005F5

Infinite Health
7EB593CF
000000C0
A76B115C
000000C0

Infinite Ammo no reloads
7E5DD3CF
00000005

Inf Health
4CBCD420
1456E6A5

Infinite Time - Arcade Mode
A0CB115C
00000032

Inf continues
4CBD87AC
1456E7A2

High score - training
4CBCD4FC
145687BD