Recommended to buy this toy. I never thought there was such a thing. I've been testing it since I got it and it's great to play with when you're stressed or anxious. I learned that you can also play with it and that it is good against dementia or for prevention. I also found that it's great for kids to learn how to memorize etc. Pretty cool, I'd buy it in other colors and shapes. I'm sure my 1.5 year old will love it.