I was unable to redeem the Groupon on their website, so I called to receive assistance. They let me know they were having problems redeeming Groupons on their website, but I could walk in without a reservation since Sundays were slow days. When we got to ClimbZone, I explained the situation, and the lady said the Groupon was only valid Monday through Friday (which was not listed anywhere in the fine print on this Groupon's webpage). The lady said they'd accept it however, and we ended up having a really great time. We spent about 1.5 hours climbing.