MagnetBlox™ Inflatable Set

The 162 magnets are no joke — the blocks snap together with a satisfying click and hold tight even when my kids stack them three high. Only wish opposite colors stuck too, but once you get the hang of it the building possibilities are endless.

My kids spent two hours building a fort out of the 27 blocks, and the magnets snapping together kept them from collapsing every five seconds. Only thing to know is they stick to the opposite color, so you can't just grab any two blocks.

Took these to the beach and the 5"x5" blocks were easy for my 4-year-old to grab and stack. The magnets hold firmly once inflated, though you do have to make sure each block is fully pumped up or the seams gap a little.