Building Block Puzzle https://www.buildingblockpuzzle.com/
https://www.buildingblockpuzzle.com/collections/custom-building-brick

When big bro and baby sis were young, they had a lot of fun tinkering with blocks. In fact, a number of studies have found that blockplay improves children’s math, spatial reasoning and literacy/language skills.

The best part was that they would often play with the same set of blocks at the same time, resulting in more complex structures than would be possible with individual pieces. They also engaged in complex conversation about the various shapes and colors as they attempted to make each one a reality. Moreover, they took the effort to teach each other about their favorite critters (and if they were not quite on the same page about a particular animal, they could still engage in a bit of competition!).
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