I almost didnt get back in last fall to Kings Island because I did not get my hand stamped. It was a Haunt weekend but it was a Sat during the day before Haunt hours. The employee at the ticket booth told me that my platinum pass was only good for one entry per day. Any more and I guess it scans invalid. She did let me in but said from then on I need to make sure to get my hand stamped. This policy makes me wonder about Cedar Point though. What if I use it there, get my hand stamped, go to Cedar Point shores and it comes off?