Where is puzzle 13 in Professor Layton and the Curious Village?

Puzzle No 19: Checkerboard Bridge.

Go to the Gilded 7 Casino,

Tap on the Laytonmobile, walk through the door on the right, (You must have solved Puzzle No 23

Go the stairs, and tap the pillow on the bed for hint coins,

Leave the hospital. Walk into the underground station and tap on the vending machine

Take the subway to Flatstone Street station, Go up the stairs to the left and have a chat to Berta.

Answer = There are 15 different routes across the bridge

Please see the related link below for a walkthrough of this puzzle.