The following are known Action Replay Codes for Ultimate Fighting Championship 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

P1 Infinite Health
012b0bc7

P1 No Health
01000bc7

Infinite Stamina/endurance P2
A2EB5255
00004326
E2AF1B50
00004326

One hit K.O. P1
7CFDD0C7
00000001
A5DB5254
00000001

Infinite Stamina/endurance P1
7CFDD0C7
00004348
A5DB5254
00004348

P2 Infinite Health
012b2bc7

Have max/infinite skill points
8ED38DA5
00000063

P2 No Health
01002bc7

One hit K.O. P2
A2EB5255
00000001
E2AF1B50
00000001