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My 11-year-old has burned through the whole deck of challenge cards in a week—the 2-D puzzles on one side and solutions on the flip make it easy for her to check her work solo. The planks click together without any fuss, and she's already stacking them into towers way past the card designs.

The challenge cards are a great twist—my daughter flips one side for the puzzle and checks the back when she's stuck, which keeps her going without me hovering. We've spent whole afternoons tearing down and rebuilding the same planks in new shapes.

We’ve been using these for a few days and my daughter loves flipping the cards to check her own work. The 2-D puzzles on the front are tricky enough to keep her focused for a good 20 minutes.