Game Secrets:Sonic Rivals
From Sonic Retro
Inside the UMD of the PSP version is text indicating that there were at one time 11 test rooms in Sonic Rivals. All but Test Room 2 were removed from the final release. The code below can be used with CWCheat to access the room. The room itself isn't playable since there is no starting point.
|0x201533E8.dword = 0x74736574 + 0x201533EC.dword = 0x6F6F725F + 0x201533F0.dword = 0x0000326D||Test Level 2|