This special lump allows the current SkullTag game modes to be reconfigured. Such game modes can be Deathmatch, Duel, SkullTag, Capture the Flag, Possession, etc.... The hard coded game modes internally use a bunch of flags to configure certain stuff and to share code. The GAMEMODE lump allows you to alter the flags a game mode uses so that you can combine game mode traits. The syntax for the lump is as follows:

GAMEMODENAME {
    removeflag FLAGNAME1
    addflag FLAGNAME2
}

Flags

COOPERATIVE

Cooperative is a flag that distinguishes the coop modes (Cooperative, Survival, Invasion) from others game modes.

DEATHMATCH

Players are spawned at deathmatch starts (needs Zandronum 3.0 to work properly).

TEAMGAME

Players are spawned at team starts (needs Zandronum 3.0 to work properly).

USEFLAGASTEAMITEM
PLAYERSEARNKILLS

Display the players kills (monsters) on the scoreboard

PLAYERSEARNFRAGS

Display the players frags on the scoreboard

PLAYERSEARNPOINTS

Display the players points (score in ctf)

PLAYERSEARNWINS

Display the players wins on the scoreboard (used in lms)

DONTSPAWNMAPTHINGS

Items and weapons aren't spawned (monsters are still spawned)

MAPRESETS
DEADSPECTATORS
PLAYERSONTEAMS

Display the team selection menu when pressing the spacebar (joining)

USEMAXLIVES
USETEAMITEM
MAPRESET_RESETS_MAPTIME

Gamemode names

Example

For instance, if you would like to have teams in coop, the lump needs to be:

cooperative {
    addflag PLAYERSONTEAMS
}