So there is a game free to play called NGU Industry’s I feel it would be fun to have a weight gain factory or lab that creates and experiments with weight gain pills or magical affects and creatures. (not to sure if someone has come up with this yet as in using NGU as a base game)
I had never even considered the idea of a factory style game being used to do weight gain, its actually a really simple concept now that I think about it lol. I can well imagine a story in which you have a character with an impossibly high metabolisum that requires an insane amount of calories to gain so much as a single pound. Hence why they need a whole factory dedicated to blowing them up lol.