Monsters listed on the left can be unlocked by using monsters listed on the right in the cities designated. Three “special” monsters are also on the list that can be unlocked via other means.

• Amanda - Kyle (Los Angeles)
• Bart - Kingston (Los Angeles)
• Bubba - Unlock every monster
• Cal - Kyle (Los Angeles)
• Croc - Rojo (Hong Kong)
• Edwin - Wally (London)
• Eyegore - Get all Challenge Stars
• Harry - Marco (Chicago)
• Icky - Ralph (London)
• Jack - Harry (Las Vegas)
• Jill - Amanda (Hong Kong)
• Joe - Natalie (New York)
• Kingston - Lizzie (Las Vegas)
• Kyle - Kingston (London)
• Leon - Any Monster (Las Vegas)
• Marco - Ralph (San Francisco)
• Natalie - Marco (San Francisc)
• Nick - Harry (Chicago)
• Philbert - Get All Par Point Stars
• Rocky - Cal (New York)
• Rojo - Kyle (Chicago)
• Shelby - Lizzie (San Francisco)
• Venus - Croc (Hong Kong)
• Wally - Marco (New York)