[Mike Garber]

Use virtual worlds.
https://sampwiki.blast.hk/wiki/SetPlayerVirtualWorld

On the pickup/checkpoint/command

pawn Код:

// EXAMPLE
            if(GetPlayerVirtualWorld(playerid) == 1) { // PLACE 1
                // CODE
            }else if(GetPlayerVirtualWorld(playerid) == 2) { // PLACE 2
                // CODE
            }

And don't bother about how many worlds there is, theres like unlimited.