A great game, whenever you try doing something that seems unintended, it seems to already know, and sounds just like it's talking specifically to YOU. However, this version does not have gmod support.

The Fallout series has had tons of changes, and while I haven't seen it all, Fallout 4 has the best gameplay, even if the story is a bit lacking. This is well worth playing if you prefer gameplay.

While the recent remake seems good, almost exactly the same but with more performance issues, the classic is certainly well worth playing, and for the creative types, you can even make custom spells!

A must have for party's with more than 5 people. You can play with 4, but 5 is rec minimum. Roles are VERY fun, but no roles if it's your first time. If you enjoy, I bet Among Us 3D will be fun!

The definitive sandbox game. Sure, not as easy to build as Minecraft, but even easier to mod with the workshop, and great if you prefer making machines, but have the IQ of a dog. A must buy!

An interesting POV swap, but inferior to Opposing Force. If you prefer gameplay, HL:OF, or if you prefer story, play this, as it certainly has a lot more story than Opposing Force.

Hide from the sun in plain sight, disguised as an NPC. A fun party game to play for 10-30 minutes, but not much more than that. Premium version MAY be fun, but not sure that it's worth it. Do TRY it.

Half Life. The classic, but better (and with Workshop Support!). This is recommended, ONLY if you have played Half Life 1 before. This is a Remake, not a Replacement

Team Fortress Classic is certainly interesting to look at for Team Fortresses history, but really poorly made. No indication that you landed the shot, and confusing objectives. Play TF2, that's free!