[last_hope]

Idea was taken from [AMXX Plugin] Mode 2x2.
So, when 4 players are on the de_dust2, plugin is adding the walls, makes de_dust2_2x2, when more than 4 players full map is opened.

upd

Video from CS1.6:
https://youtu.be/6RKFnAXTNG4

[pride95]

i'm looking for this

[CowGod]

Very possible, I feel like this is relevant https://forums.alliedmods.net/showthread.php?t=281073

[CowGod]

You could probably use devzones api https://forums.alliedmods.net/showthread.php?t=224839 and make zones that push players away from certain entrances and block them from going into them.