Dr. Mario Valentines
The Paper Magic Group / Nintendo (1990)
Remember back in the day in when we'd all make boxes out of construction paper and tape them to the front of our desk, and then we'd all walk around the room dropping valentines into everyone's box? Well, if you went to elementary school with me, there's a pretty good chance that you got at least one with a Nintendo character on it.
These Dr. Mario ones were sold in 1990. It's a strange choice of a game to base valentines around because the only character in the game is Mario himself. I guess you could say that there are four if you count the red, yellow and blue viruses, but they create a whole other problem. "How was school, son? It was great - Lori from homeroom gave me a virus for Valentine's Day!"
They kind of shoehorned Princess Peach onto a few of these despite the fact that she's not in the game, and they also went out of their way to label the pills as vitamins. I suppose the folks in charge thought might be in poor taste for kids to give each other pills, even if they are printed on paper and surrounded by hearts.