Rome Total War (or any in the series) - The Art of War by Sun Tzu

How about Crime and Punishment for Silent Hill 2?

basic white bread take i'm throwing out but mm legends fans gotta read 20,000 leagues

Death Stranding draws a lot of inspiration from the works of Kobo Abe, particularly his short story Nawa. Kojima also stated that The Draining Lake by Arnaldur Indriðason was a key influence.
The Metal Gear Solid titles draw a lot from Kobo Abe's other works, namely The Woman in the Dunes, The Box Man, and The Face of Another. Abe's The Frontier Within essay collection was important for Sons of Liberty. Ryu Murakami's Coin Locker Babies was a broad influence for Kojima, and the inspiration for Silent Hill 4: The Room.

Inversely, Satoshi Itoh's Genocidal Organ and Harmony were inspired by Snatcher and Policenauts respectively. Itoh's Genocidal Organ then served as a reference point for the nanomachines in MGS4.
Further to Disco Elysium, Snapshot by Brandon Sanderson, and Guards! Guards! by Terry Pratchett are rather similar, the latter getting a lot of the same humour down pat.

Some more for Disco Elysium fans, The Last Policeman by Ben Winters, Fear and Loathing in Las Vegas by Hunter S. Thompson, and Moscow to the End of the Line by Venedikt Erofeev are primo choices.

Cyberculture, by Pierre Levy. It's an academic book by a philosopher about how videogames, internet and stuff are cultural phenomenons, and need to be seem as such. A must read for those who enjoy cyberspaces and/or believe videogame is art in the same level as literature, film, music etc.

Despite it being an academic book, it's very easy to read, at least in the french original. BR academics have the habit of unnecessarily complicating things, specially when translating from french. But I only read this one in the original and is very confortable, don't know how much the pt-BR and english translations may feel too-much-mannered-and-convoluted.

I have no idea which specific game I'd suggest it to, since videogames are in themselves the theme of the book. XD

The Shadowrun ttrpg (and therefore the Shadowrun Returns video game series) took a lot of inspiration from Neuromancer by William Gibson, which resulted in Gibson being pissed that what was pretty much his setting had elves in it.
Hell, Neuromancer is probably a better fit for Cyberpunk 2077 but I haven't played that game.
If you want a bit of a stretch, Wolf in White Van by John Darnielle and Going Postal by Terry Pratchett both remind me of Fallout: New Vegas in WILDLY different ways.
I'm tempted to suggest another book for Disco Elysium...

Thank you all for your suggestions!