Ist kongregate.com sicher?

No security issues and is generally fast. Unfortunately, many Flash games don't load (the site uses a browser extension to let you load them, but that can be unsafe as an attempt at a site has been reported when I loaded one), and you can't usually get badges in those that do, and there are no new games being uploaded on the site (but existing ones still get updates), so it's going to feel increasingly dead each year.

Good flash games site, some games involve gore, but if you can handle a bit of blood you should be fine. The community loves to tell tons and tons of jokes, but it depends on the game. Oh yeah, there is a chat room for every game, which I think is cool. Overall good site, fairly trustworthy.

Its Flash, HTML5, and Unity games, nothing really harmful at all. There might be some games with blood and gore in these games and maybe some nudity, there has been none I have seen yet but might be a chance its there. All in all 13 and up you are fine, 6 and up your parents should check on you every once in a while, under 6 years old... you shouldn't be here, Youtube Kids and learning sites are really the only sites kids under 6 should be.

Definitely one of the best website for flash games. Games hosted there are great and you can easily find game for you since they are all tagged with categories. I have been subscribed to their newsletter for a while, getting the best games of the week is a nice reminder to I need to relax. They also have their own level and achievement system which make you want to keep coming.