Keep the fire lit to "roast" the marshmallow. Your goal is to reach 750°C without going below 200°C Rain will cool down the fire when it touches it. You can place towers to protect the fire from the rain. This however uses up some of the fire's heat. When you reach 750°C, Scratch cat will come and eat the marshmallow. Also it isn’t mobile friendly. I made the temperature go up faster because it was too slow according to @cheekybubba5