Protospiel is an event where you can bring a board or card game prototype to play with other designers, play testers, and publishers. It's a great way to break your game and to fix it. It doesn't matter what level of polish your game has. Many games are made right on the spot at Protospiel using the free prototyping materials provided by The Game Crafter. But there are also many games there that are just doing final testing just before they are published or put out on Kickstarter.