The Great Circus Mystery Starring Mickey & Minnie Cheats

When in Stage One, the Haunted Circus, you will start the game on the fairgrounds. Just ahead is a small pond with an enemy fish swimming in it. At about halfway through the water, there is a wooden support beam in the background. Swim past this and you will receive a 2-Up.

In Stage Two, the Jungle, there is another opportunity for a hidden 2-Up. After beating the halfway boss (the giant turtle), you'll go a couple more screens and come to a section where you'll use the Safari outfit to slide down a number of vines. After reaching the bottom vine, swim in the water beneath, all the way to the left. The word ''2-Up'' will appear when you have found it.