The town's mayor has gone missing (Mickey, when playing as Minnie and vice versa) and Mickey's arch-nemesis Pete appoints himself as the new mayor. Soon his influence changes the town: a giant factory is built and all the money is stolen from the bank. The player needs to find out what has happened and return the peace.
Mickey Saves the Day is an adventure game, with 3D characters against 2D-rendered backgrounds, for children, designed by David Grossman and Casey Donahue Ackley of LucasArts adventure fame. Players can choose to be Mickey or Minnie Mouse and many Disney characters make an appearance, such as Goofy, Donald and Daisy Duck, Pluto and Ludwig von Drake. The game is entirely mouse-controlled and the cursor changes when an object can be interacted with. It can either be used or picked up to be stored in an inventory, shown as Mickey's hat at the bottom of the screen. Puzzles are solved by talking to other characters or through items. All visited locations are added to map to move around town.
Next to the main quest there are 5 mini-games, shown with a different perspective, with logical puzzles. The characters need to escape from a maze in a factory, cross a busy street, play a musical composition with birds (which can be saved in a songbook), create a sandwich with different ingredients, and help Goofy clean up trash with Mahjongg-style gameplay. Some of these are required to advance in the game. There are also empty cans littering the different locations. When all of them are collected, a bonus cut-scene is shown at the end of the game. There are two difficulty levels, influencing the puzzles. These also differ based on the character the players chooses in the beginning of the game.