$8.99 + Shipping
This will keep you going for hours. I've never finished one myself, but my nerd bofriend can do it in 10 minutes. Get one for your kids, it'll keep them forever occupied. It's the "ultimate brainteaser game."
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Discovery.com

$10 off $50 Online Coupon
Get $10 off your order of $50 or more when you enter this online coupon code at checkout.
Discovery.com Coupon: COM10  -  Expires: Unknown