This game was a custom thing that I did. Very simple. I made 1 cart.
The original intent was to use market it for people to commission me to make them games for special occasions that used custom art work, messages, whatever. But it was way too much work and no one ever asked me to make them one.
I used this cart to propose to my wife. I made a number of screens based on inside jokes and stuff, each would play in series when you pushed the advance button. At the end, a “Will you marry me?” popped up. It played Pachelbel Canon.