These are game modes that Space Station 13 Servers can run. Note that only the modes available on Goon Servers are listed here - other servers may run different modes, such as Plasmacrisis or Welder.
“Extended Mode, which is effectively the same as the rarely-seen "None Mode", is a mode in which...Extended Mode
“Nuclear Mode is a game mode in which the crew of Space Station 13 must fend off a group of...Nuclear Mode
“Traitor Mode is a mode in which a lone Syndicate Agent aboard Space Station 13 must complete a...Traitor Mode
“Meteor Mode is a game mode in which a dangerous Meteor Shower will ravage Space Station 13. The...Meteor Mode
“Secret Mode selects randomly between Monkey, Traitor, Nuclear and Meteor modes and will not tell...Secret Mode
“Blob Mode is a game mode in which the crew of Space Station 13 must remove a rapidly spreading...Blob Mode
“Monkey Mode is a game mode which pits virus-infected Monkeys against the crew of Space Station...Monkey Mode