It offers modders an API of sorts for anyone that wants to create vanilla compatible custom game modes. Any custom game modes that are added will be listed in the game creation menu and shown in the server list to anyone else with CustomGameModes.
To show off what CustomGameModes can do, it adds back two game modes that used to exist: Baseball and Standoff.
Everyone is given bats and must hit other players out of the map. This is actually a game mode that existed during Dani's development and play testing of Crab Game, before its first release. You can actually see it for a couple of seconds in the game's trailer at 0:23 for 4 seconds. However, the maps Haven and Icy Haven were never included in Dani's publicly released versions of Crab Game, so I made it use a bunch of other random maps.
Everyone are given revolvers with 6 shots (starting everyone with 6 "marks" aka penalties), and every couple of seconds the game will toggle between being able to shoot and being unable to.
Players that join you without the mod will...