I think 16 would be a perfect number(plus 2 for staff only slots)
TTT gets way too hectic at 24 people. It also gets extremely laggy, and most maps can't even handle 24 players size-wise, just like Brass said.
TTT gets way too hectic at 24 people. It also gets extremely laggy, and most maps can't even handle 24 players size-wise, just like Brass said.