Information can be found here-
https://youtu.be/hvWQilQ85GA
It was not released on Easter, but still is an egg.
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https://www.youtube.com/watch?v=IPc88E4vBD4
I may just barely be fast enough for top 5, but it's top 12 that qualify over multiple rounds, so no big deal.
https://store.playstation.com/#!/tid=CUSA24769_00
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https://www.youtube.com/watch?v=6eFQ1Rf3x4c
No hill needed for this one to wheelie
Link to how to make it wheelie car--
https://youtu.be/9M-H2e_xN74
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https://www.youtube.com/watch?v=1nZi1NGdNE4