Lumosity customer service is pathetic! Some of the games are interesting, but forget it if you expect scoring that makes any sense. I don't think even they know how it works. When I ask they say scores are based on an algorithm and they cannot reveal the algorithm. Hmmm. I usually don't buy anything online from a site that does not have a customer service phone number or chat line. Made a mistake this time. Emails take days to respond to, and usually are unresponsive to the question asked. Training reminders work sometimes, sometimes not. They need to address their problems, but they will have to do it without me when my subscription runs out. Waste of time and money. I give it two stars only because I enjoy a limited number of their games.