[Raddify]

What is a good one,
preferably co-op or singleplayer.
TYVM!

Update, I like fantasy games, looking for stuff under $30 unless it is extremely good.

[freestlr]

What genre do you like the most? There are multiple good ones, Metal Gear Solid 5 (not sure if it is repetitive though...), GTA, perhaps a skyrim or Dark Souls or Bloodborne or Witcher?

I've seen some videos of GTA 5 multiplayer and it looked awesome and funny! Search youtube for Markiplier and check out his newest videos, he is playing it with friends and having a BLAST!

[Warbeak]

Elite: Dangerous, Life is Feudal: Your Own, and of course the super popular ones, Fallout, Skyrim, GTA V, etc.

Project Zomboid is amazing, my personal favorite survival/open world game

[I Roar too Much]

minecrafttttttttt jk

You can try the Gothic game series. (Gothic 1, Gothic 2 and, Gothic 3 are the best)
You might like Risen too. (Risen 2 and Risen 3 are also great. They're a bit newer than the Gothic games.)
Any of the Elder Scrolls games. (Morrowind, Oblivion and, Skyrim are great. The original 2 games can be found for free, Arena and Daggerfall)