Review on EP EXERCISE PLAY Building Compatible Learning & Education by Bryan Cavalcante

As mentioned above, the instructions are very poor and difficult to understand even for adults. There are enough supports in several places to hold the marble walkway together. If your child presses on it, it will fall apart. Also, depending on the design you build, the balls may not flow top to bottom and require a little nudge to move them. I found that by adding a few blocks from a different set of pits I could strengthen most weak spots, but for the money it's worth that shouldn't be necessary. Finally, the balls are about 7/8 inch in diameter, making them a significant choking hazard for small toddlers.