Quarth is one of my favorite games for the Nintendo Game Boy. But I had lost the instruction booklet for it. So I purchased one on ebay and have scanned it in for others to read. I have it shared on Google Drive and it can be viewed in the link below
In 2017 hackster.io ran a contest with Make called Make:’s Magically Mathematical Pi Day Contest. The theme was to make something Pi related. I made this game that tested how many digits of Pi you could remember. My entry won first prize.