Presenting PORTALBALL - the best portal coop map ever.
What's so special?
PORTALBALL is unique; it's a map designed for two players not to cooperate, but to compete.
PORTALBALL brings you enormous amount of fun, by giving you and you friend a chance to spare in a real duel. Rules are simple: Both of you press buttons on the wall, then it's just a pure fun - you need to grab the ball and drop it to your opponents goal. The first one who count five points on his score table (above the goal) wins the match.
donwload link(steam workshop):
http://steamcommunity.com/sharedfiles/filedetails/?id=90806279&searchtext=portalball

. Detailing in Hammer WOULD make it more interesting but it's pretty much fine as it is 