Skate Park City (Sony PSP)
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Get a certain amount of Medals to Unlock Characters
Doing missions will get you a minimum of 1 medal, but if you do them quickly you can get either 2 or 3 medals. You also get medals by doing side missions.
Unlock Joy
Get 85 medals.
Unlock Lee
Get 135 medals.
Unlock Zoe
Get 35 Medals.