A classic, very fun. Everone needs to play this game, especially if you a fan of Valve.

Hard to get good at it, but once you do you can produce amazing things. Even if you can't get good at it you can still have a lot of fun with it.

Fun game, bit short, but fun to play with friends.

Really fun, you can do anything and addons make it never get old.

Very challenging but fun none the less.

Fun to mess around with.

Fun, you'll enjoy it more if you've played previous games, but it can be enjoyed by all.

Fun puzzle game, really gets you thinking.

Not much different than the first one, but it adds enough to be better than it, and you can play the original campaigns so you might as well get it.

Incredibly fun, may get boring after a while, but you'll always come back to it and you can always have fun with it.