I’ve got Wedgits blocks for my children and we get loads of fun with them. Boys are learning about patterns, balance, geometry and they don’t even know it. Here is Max randomly stacking blocks. As for Alex, we got Wedgits Junior Design challenge cards for him with different levels of difficulty to keep him busy too.
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I also would like to suggest you to buy Wedgits Junior Design Cards. Cards would explain to your child how blocks work