Mine is vehicle building games like Stormworks or Scrap Mechanic. It’s so much fun to shoot at your friends with your latest nuclear drone while hiding in your bunker with a better defence system than Area 51 !
I’m very curious about your fav niche game genre !
(I’m sorry for my bad English ^^')
“Open world” puzzle games. What I mean by that is that you can go and solve any puzzle you like in the world. Nothing is linear. If a puzzle stumps you or has you frustrated, you can always leave and go try another one. The last good one I played was The Talos Principle and I’m heavily awaiting the sequel which is supposed to come out this year. Other good ones are the Myst series, Quern, The Witness, The Outer Wilds, and a few others I can’t remember right now.