GRAMM
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You can even have 3 teams if enough people join, but I don't think more than 3 is a good idea, otherwise the game will take a very, very long time.
Added 4 minutes later
Well, if you play for 1-2 minutes each and the map is the smallest and without an underground level (you can even use weak monsters to shorten the game time), then I think you can play with 3 teams.
Added 4 minutes later
However, I don't think the difficulty should be less than 160 or 200. Although, only for the sake of shortening the game time, you can reduce the difficulty, but this is also a debatable issue and it remains up to the tournament organizer.
Added 7 minutes later
In these considerations, I am proceeding from the fact that a professional remains a professional at any difficulty level, and a lower difficulty will only speed up the time it takes to complete the map. And since everyone will be playing at the same difficulty, everyone will be on equal footing. However, the question remains: what can each player build in their Castle (and what Castle will it be) at a lower difficulty, and what advantages will this give them.
Added 4 minutes later
Well, if you play for 1-2 minutes each and the map is the smallest and without an underground level (you can even use weak monsters to shorten the game time), then I think you can play with 3 teams.
Added 4 minutes later
However, I don't think the difficulty should be less than 160 or 200. Although, only for the sake of shortening the game time, you can reduce the difficulty, but this is also a debatable issue and it remains up to the tournament organizer.
Added 7 minutes later
In these considerations, I am proceeding from the fact that a professional remains a professional at any difficulty level, and a lower difficulty will only speed up the time it takes to complete the map. And since everyone will be playing at the same difficulty, everyone will be on equal footing. However, the question remains: what can each player build in their Castle (and what Castle will it be) at a lower difficulty, and what advantages will this give them.