I'm, finding that around half of C&K games are ruined because players are accidentally getting into them when they don't realise the difference. They usually wan to escape after the first couple of turns, and the game has to be abandoned. A very bad experience for all players! Would it be possible to highlight the "Cities and Knights" part of the brief description under "Open for Joining"?
Or even add an extra sentence " Make sure you understand the rules for this version"
Or even add an extra sentence " Make sure you understand the rules for this version"