Arch Linux. Everyone said it was hard to use, unstable, etc. but my experience with it has been the exact opposite.
Yes, the install process is needlessly complicated (although it got a lot simpler now that we have archinstall), but the OS itself is rock solid and rarely has any issues that require more than a reboot or a package reinstall to solve. The AUR is a godsend too if you don’t want or don’t know how to compile stuff from source.
Talos Principle, without a doubt. That game feels like it was made for me, I love puzzles, computers and philosophy and the first time was such a blast.