to make a situtation much more difficult or confusing: The snowstorm is really playing havoc with rush-hour traffic. it also means to damage something: The acid rain plays havoc with marin life. hope I have helped you

Wow, havoc means chaos or disorder but, honestly, I would never use the expression like this. Maybe causing havoc, but playing is sort of off. To cause havoc is to distill chaos or disorder.

A⚚P ☾☼ [D3] might be being a troll, or maybe doesn't know what he is talking about. Either way, I suggest you ignore that comment.

I hope it helps

Thank you