That's for new players and oldschools that dont know some new settings. Main game settings/rules played on voobly.

RM - Random Map - Settings

RM Reveal 1.5 / RM rev 1.5
- No rules (any rush), reveal map, speed 1.5, resources default, age default

Usual 1.0 - No rules (any rush), no reveal map, speed 1.0

IVS 1.5 reveal or no reveal - IVS is an AOE mod that improved the civ balanced. More about IVS: http://www.voobly.com/gamemods/mod/220/IVS-with-EEA

Korea / Kor 1.5-2.0 - No Rush, No Tool Unit, No Wall, No Tower, No Attack Till Bronze Age, resources default, age default (ps: wall may be allowed if all players agree), map (Highland - no river)

RM RC ND - No rules (any rush), no reveal map, speed 1.5, resources default, age nomad

Iron High (old brazilian setting played on IRC) - No Rush, No Attack Till Iron High, resources High, age default

DM - Death Match - Settings (all games start in Iron Age)

NS (means No Siege) - No Siege, No Wall, No Tower, No Priest

Reg War - no rules

Arch War - only archers are allowed

Cho War - no wall, can only pick choson as civilization

Wonder Race - Whoever builds the wonder first wins

Tiny - no rules, tiny map

Other Settings

Man hunt - start in nomad age, no reveal map, tiny map, you just have 1 villager, can't make any unit or building, you have to kill other players villager and not get killed, last one to survive wins.