My grandson first discovered these in the library. He is very happy to reconfigure them. The only downside is that they need to be assembled very solidly to move smoothly, which of course means they're a bit difficult to take apart.
655 PCS STEM Robot Building Toy Set - 6-In-1 Fire Truck Kit For Kids Age 4-8
19 Review
STEM Robotics For Kids: PANLOS 655 PCS Military Vehicle Building Blocks Set For Ages 4-8
30 Review
City Police Station Building Kit With Cop Cars, Police Helicopter, Prison Van, Fun Police Toy For Kids, Best Roleplay Police Department Construction STEM Toy Gift For Boys Aged 6-12 (808 Pieces)
23 Review
STEM Learning Building Bricks Toys - 832 PCS 8-In-1 Robot Building Kit For Kids, Including Armored Police Car Engineering Construction Vehicle Blocks Set, Ideal For Boys & Girls Age 4-8
14 Review