Tangoes JR is the perfect tangram puzzle for young minds and hands! I bought this for my daughter when she was quite young. It is a travel-type game where everything stores inside, and it has a convenient carrying handle. It comes with the 7 standard tangram shapes, and they all store inside a durable drawer. They are even magnetic so they stick to the puzzle working board. The top flips open to reveal storage for the challenge cards. Level 1 shows where the shapes are placed, which is great for younger solvers! Level 2 just shows the picture, so definitely the more challenging side! All the challenge pictures are appropriate for kids and most of them are cute too!
This has been, by far, the best puzzle we've ever owned! Tangrams are just awesome anyway, but this set puts it all together very nicely. I have to admit that at 9 years old, my daughter finds it a little babyish, but we spent a couple hours the other day working through all of the challenges together and it was still fun!
So if you're looking for something to challenge your little ones, this is the best puzzle option! The box recommends ages 4 and up, but with proper supervision (there are some small pieces), I'm sure younger kids would love it too. And playing with puzzles with your kids is a great way to spend time together! This is also awesome on long car trips.
You can find it on Amazon. My favorite place to buy puzzles is Mindware.com. You can get lost browsing all the other goodies on their site too, so be careful!