Searching for PC Games

I just remember the most fun Id had at a "Thinking game". Check out "Talos Principal". That was quite enjoyable and not one unicorn in sight.   

I suggest you consider Divinity Original Sin 2 (you will want access to the Definitive Edition. You are going to find that to play your game it will be via streaming off the internet. Original Sin 2 is a turn based strategic Role Playing Game where you manage four characters in a combat oriented game full of a rich story and challenging but not unfair puzzles. You can go wherever you want in the world. There are different difficulty options to help with how hard learning the game can be for new players to a modern RPG. Google the game and you can find walk-through, character selection help, tips etc.

WOW! What great compendium of games from Tidgxor! I've been an avid gamer since 1985 (Starflight), and I don't have that eclectic a portfolio!   

The Total War games mentioned for sure. You strategize on the main map and then manage large tactical battles with your custom armies in a battlefield scenario. Your tactics may overcome weakness to win the day!

I am very fond of the Fallout series. There is a lot of combat but much can be avoided by stealthy tactics, and the story lines are very deep. Lots of game-altering choices.

The Witcher series is a fascinating fantasy mythos starring an outcast mutant who specializes in "monster hunting" for bounties, caught up in political intrigue. A fascinating role to play.

Since I like very much planning out tactical close combat, I absolutely LOVED Shadow Of Mordor. I look forward to Shadow of War like one might save that very special dessert for later.

Civilization is, indeed, the premier Strategy series. I literally have thousands of hours in the series. I've played since Civ I in 1990; they're now on Civ VI. It's extremely challenging on the higher levels. You must find the delicate balance for victory.

I'm enthusiastic about some of the suggestions. I think you've found a terrific answer!