There's a man who creates multiple accounts ending in Cyllinder or Sphere. He joins games to ruin them - especially teamgames, attacking his mates. Is there something that can be done about it? Like blocking his IP or whatever. So far the only solution that works is blocking lvl 15- players using lvl prereq but... but this prevents noobs from playing many games.

Blacklist his accounts. if he is using abusive language, you and other players can report.

When he is your teammate, kill him first. Thereafter, kill all other enemies.

Report

Well, as I said, lvl preq works quite well at 15 or higher. I wrote it out of frustration though as reports are going into void and this person ruins game experience for all of us. It's not possible to blacklist all of his accounts as he made like 15 accounts and keep adding more. Just keeps joining team games and destroying them.

The thing is that being a crappy teammate is not explicitly against the rules, even if done on purpose...
Settings game prerequisites is the only way to go I think.