Nice Riddle, the link is still up, not everything letter is in mayus, and the operator might be a bit ambigous, if you didn't play the games, and depending on the AI you ask, (you can also just try all the letters like i did)
Hellor sir, the link seems to be down for me atleast, i decoded the string into a goFile link but the contents does not exist. Can you update the link?
Thank you in advance.