They have 3 different coupon codes right now. Please note that you can only use 1 coupon code per purchase.
To take advantage of 25% off all puzzles use the code NPUZZLES25
To take advantage of 15% off your order use the code NSAVE15
To take advantage of free shipping use the code FREESHIPZERO
These codes are good until 12/16/11. Head over to Melissa & Doug to see all their great items.