I can't seem to really do anything with this but maybe you'll have better luck?
Game Type - Value
Team Deathmatch 0x00000000
Capture The Flag 0x00000001
Containment 0x00000002
Assimilation 0x00000003
Free For All 0x00000004
ALL 0x00000005
RogueAgent (PVP_GMODE_ROGUE) 0x00000007
Sabotage (PVP_GMODE_SABOT) 0x00000008
Default 0x00000009
UnknownMode 0x0000000A