This might be due to the browser settings on the computer you use; if they remove cookies or erase history on close, many of the Arkadium-based games lose history then...
That makes total sense @WebWiseWoman , and explains why those puzzles show as not played for those folks on the computer having that issue. The privacy/security setting on the browser would just need to allow the exception made for AARP site cookies, to not clear those cookies at close. While still continuing to clear others site’s cookies. 👍