Isolate yourself from your demons both mentally and physically. Say take 200 days, workout at least twice a day with no access to your vices and get 10hrs of sleep a day. Remake your foundation physically then remake yourself mentally. Essentially tear yourself down to core primal essence and rebuild how you want to be. Then surround yourself with good people and build the skills you always wanted. It’s extremely tough mentally but when done you won’t recognize yourself afterwards, you’ll be a rock and hardened.
I didn’t have a Gameboy, but I did have an Atari Lynx and I would say for Atari it was Batman in color.