On The Fourth Map (Mall Map) -
There Is A Neat Back To The Future Reference If You Search Along The Map.
- Look For Some Lightning, Then A Car.
Find "Barks" Pet Emporium And Pay A Coin To Get A Bone
- Must Be Carried In Your Coin Bag
Go Give The Bone To The Dog Standing On The Car, Then Pay The Coins To Drive It.
- Achievement Unlocks When You "Mount" The Car
Good Luck!