The award winning Pengaloo is visually appealing and features an element of surprise. Players try to find colored eggs (hiding under the wooden penguins) corresponding to the colors on dice. It's a little more involved than straight "Concentration" but basically the same idea, it's a memory game. There are suggestions in the pamphlet for variations and of course, you can make up your own.
I'm a big fan of board games and think it's a great way to bond with your child. On day one, I played this game with my son for a good hour, with lots of "Let's do it again!" Then he continued to play by himself for another hour. He's gone back to it many times since and says it's one of his favorite toys already.
On a practical note, the box, made of recycled and recyclable cardboard, is sturdy and designed to house all the pieces nicely for easy cleanup and storage. I highly recommend this toy. Ages 4+/Blue Orange Games.