Gaming

Death Stranding makes the player think about how to walk over difficult terrain with a large amount of cargo on their back without losing their balance and falling down. Most games allow you to run as far and recklessly as you want without having to worry about falling, so it was interesting to actually have to work at it, at least before you unlock various modes of transportation.

Battlezone '98: One of the first notable RTS/FPS hybrids. You drive hovertanks and you build bases and you command other tanks. Set in a secret live war on the Moon, Mars, and Venus between the USSR and the USA during the cold war.

Opus Magnum. It's an optimization puzzle game. You have to assemble mechanical arms and other bits (that grab, swing, rotate, push, and pull) into contraptions that assemble resources that look like molecular diagrams. Optimization puzzles aren't unique but I felt like the pieces you build the contraptions out of in this game are pretty unique, the game is on a hex grid so rotation can play a big roll. Another interesting thing the game does is that to beat a level you simply have to accomplish a proper assembly, which in itself isn't that hard, but the game grades you on three different metrics (speed, size, cost) and gives you no overall score to tell you how much you should value each metric. In this way it is up to your preferences what you want to optimize for if anything. I had fun trying to minmax every stat separately on every level before building my "compromise" machine was not supposed to make big sacrifices in any field.

A lot of people have mentioned it but I definitely recommend Obra Dinn, haven't played a mystery game as unique and enthralling.

Dwarf Fortress mostly doesn't have unique gameplay mechanics or anything; but the Legends viewer certainly is a unique feature, due to how all the systems work together to weave randomly generated stories and history of the world through the entire world generation process. So even though you didn't play the game through all those years, the game still kept track of everything going on while simulating the world creation and you can go through it and see all the battles, conflicts, migrations, rise and fall of civilizations, deaths of monsters, etc.

Its retro and really rough around the edges (and QTE heavy) and is more of a life sim than a traditional adventure game, but Shenmue I & II introduced day/night cycles with NPC schedules, has a fun martial arts combat system, and the story is kind of like an 80s martial arts film with a detective kick. There's also gambling, drinking, a little bit of working at the docks, darts, retro arcade games, and some sleuthing to progress the story. Your progress from Shenmue I carries over to II

But again its rough around the edges and sometimes referred to as QTE simulator (or Dock Worker Simulator, as I jokingly call it). But somehow, all these elements blend together well to create a unique game. Not going to be for everyone but I really enjoyed it

Final note: I highly recommend using a controller. I ran into issues with KB+M, especially after remapping keys. It broke some of the QTEs.

The Misadventures of P.B. Winterbottom

Ancient Art of War. Really old RTS where food, morale and exhaustion are all-important. You'd think it'd be a micro-management nightmare but it plays smoothly. Unfortunately not multiplayer and never remade or even imitated, for some reason.

Very surprised that A blind legend didn't make it here, among all those suggestions.

The Swapper: 2d side scrolling puzzle game where you clone your character and swap consciousness between the clones.

The first two games that came to mind are unfortunately only available on PS4. I'll mention them anyway, just in case they come to PC in future or someone else that has a PS4 is interested: Tearaway Unfolded is a really sweet game in a paper craft world. You manipulate paper scenery to help with platforming and really customise your character in creative ways. Just a unique and charming game. And Gravity Rush 1&2. These games let you alter gravity to fly around a beautiful open world - I've never played something with a traversal and combat system like this.

I agree with Obra Dinn and the Witness as mentioned by others!

This is probably a weird suggestion, but you could emulate Metal Gear Ac!d 2 (PSP game). It's a stealth game (like the rest of the MGS series) mixed with a deck builder, so your actions are dictated by the cards that you play. The second one in particular perfects the formula IMO. It's super satisfying and I'd love to see more games of this type!

Soul Reaver comes to my mind. Old game but i think it‘s still holds up.

Life is Strange - At least the original, the sequels are not quite as unique. It's an interactive story (though still in 3D) where you can rewind time to redo conversations, effectively making "save scumming" a core mechanic. The designers use the fact that you deliberate on your own actions quite well. The story is also pretty unique, but unfortunately there isn't a good way to explain why without spoiling any of it.

Inscryption - On the surface, this seems like your run of the mill card game. But once you get familiar with the mechanics, some other genres start blending with it.

Edit: Should also add:

A Normal Lost Phone - The premise is that you find a phone that someone has lost, and you can use it to slowly uncover the story of the person who lost it and why.