The Red Shoe is an obtainable item in Silent Hill 3. Heather Mason picks it up from the Children's Amphitheater area of the Lakeside Amusement Park. The stage is completely empty, save for the small red shoe. It is used in the Marchen Travel Puzzle on the wax figure of Cinderella so that Heather can pass through to the next area of the amusement park.
While a glass slipper is more familiarly associated to the story of Cinderella, this slipper is, as Heather describes, "blood red." This likely alludes to the original story where the slipper gets covered in one of the stepsisters' blood.