Mine would be creating pen and paper ciphers for my made up secret communication needs.
Imo Dead Space was the last decently made mobile game. After that the F2P craze started and never stopped.
I mostly play modded games anyway. Well, i used to. Now i only play java games using j2me loader.
I went back to PS2 era games. This was the golden era imo, where games came out in a playable state and an amazing amount of content. Right now I‘m playing a completely English translated version of Monster Hunter 2 on a private server that went live about a month ago, it’s amazing.