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I think the "question box" sounds good... The only thing is, it will probably be visible to all players... And there might be several of them in multiplayer.
Added 3 minutes later
And also - maybe just create two maps - one for multiplayer and one for single-player? Copy and paste, changing the necessary scripts and the map type.
Then you'll definitely get one that works in single-player.
And as for its multiplayer copy, which can also be launched in single-player mode, you can simply add a check, and if all players except one are AI, then set it to "loose."
Then in multiplayer, you will definitely have to play against a player - after all, it's multiplayer. And there won't even be any point in launching a multiplayer map in a mode without players.
And single-player... will remain single-player.
Added 3 minutes later
And also - maybe just create two maps - one for multiplayer and one for single-player? Copy and paste, changing the necessary scripts and the map type.
Then you'll definitely get one that works in single-player.
And as for its multiplayer copy, which can also be launched in single-player mode, you can simply add a check, and if all players except one are AI, then set it to "loose."
Then in multiplayer, you will definitely have to play against a player - after all, it's multiplayer. And there won't even be any point in launching a multiplayer map in a mode without players.
And single-player... will remain single-player.
Whatever