Mini-Game Monday is a Youtube playlist of impromptu games in Rec Room compiled by mamamonkey

Impromptu games (also known as "mini-games" and formerly as "player-created games") are played in rooms that weren't made for these games. Therefore, the rooms don't have built-in game rules. Thus, the rules are flexible, but players have to communicate and agree on the rules that they want to play by. In Rec Room, impromptu games were most popular before Circuits allowed to implement game rules in Custom Rooms.

Some examples are:

Many more games without built-in game rules are being played in Rec Room. In many cases, custom rooms have been created to support specific games without implementing the game's rules in the room. Examples include:

Related to impromptu games are customized versions of #RecRoomOriginal games, e.g. Paintbow.