I have recently purchased these for my son (kind of for hubby and I too haha) and for 2 other people's children for Christmas gifts. The price is a bit up there but what no one realizes when buying Discovery Toys is that there is a LIFETIME WARRANTY! Yes LIFETIME meaning if your child breaks it they replace it. PERIOD! REALLY!
These little squares with marbles inside come with cards to challenge you to match the pattern before the other player does using only your fingertips since nothing else will fit inside the holes.
It is seriously addicting and I can tell you I've played it with my kids a lot selfishly because I can't get enough.
It's a great learning tool as are all of their toys but I have to say it's worth the money since I know it will be used for many years to come by all of my kids (and us parents).
Also zero instruction required by adults!!! Pull out a card and race to finish. That's it! My 4 year old can play it all on his own!!