This is the first game with the boy who looks like a flame and the girl who looks like a drop of water. The game begins by entering a forest with trees and plants. When you begin playing the game, you'll notice that the colors are brighter than what you might expect in a traditional forest. However, the voices of characters in Fireboy and Watergirl 1 are exciting and make it fun to play the game. There are multiple levels in the forest that you have to get through in order to finish the game. At the end of each mini-level, you will go through a door to reach the next level that you have to play.
This is a game that takes two players if you want a better chance at succeeding. If you're playing alone, then you have to plan ahead and look at the other portions of the level to determine who should go first to depress the buttons and switch the levers that will make the floors move around. When the floors move, the other character can stand on the platform to get to the upper areas of the screen that lead to the end of the maze. There are certain keys that you have to use to maneuver Fireboy and Watergirl. Each level leads to another level, but once you get past level three or four, they all start flowing together. If you can't get through one, then you can choose another level to play until you have a better idea as to how to defeat the one that you skipped.
Fireboy can't walk across the water lake, and Watergirl can't walk across the fire lake. Both of them have to avoid the green goo lake. However, both of them can jump so that they can get across the lakes and reach the switches and buttons needed to get to the top of the screen. If you get into the lakes, you can start over or end the game. You have to think ahead in the game. Send the character who can get farther without getting killed to navigate the switches and buttons for the other character. One thing to keep in mind is that both characters run very fast, so you have to make sure to stop them right before the lakes so that they can jump over them.