For me it’s Deus Ex Mankind Divided. I played the original when it was new but barely remember it and I owned shadow war and never got into it.
However Human revolution blew me away. I loved that game so much. I still think about it and actually am making this post because I finally started cyberpunk last night and got human revolution vibes like crazy.
However I bought mankind divided on my birthday when it released. Happened to be right around the same day. I turned it on, walked a few steps and turned it off. For whatever reason I’ve never turned it on again.
Doesn’t require a big time investment. The mechanics are easy to get the hang of and the story is pretty short.
Lots of replay value if you’re into speed runs like I was back in the day but the main story is like 2-4 hours.