You can create arbitrary game modes on the game modes page under admin.
Game modes may be tested with the test url by using the name of the mode as the last part of the url. [gamename]/play/test/special tests the special game mode. [gamename]/play/dev/tutorial tests the mode on one tab.
Game modes may choose to load the user’s latest selected deck from their collection page or not. If no deck is selected, you can load decks in the rule cards or make your player choose cards to start.
Game modes may replace rule cards with rules that are specific to that game mode. Rule cards that have the `reqGameMode` custom property will load only on that game mode and replace any default rule cards with the same name only on that game mode.