I bought these tiles with trepidation as the only magnetic tiles we’ve played with before were in a library and they were extremely difficult to build with even for an adult as the magnetic bonds were so weak. We opened these up tonight as I don’t have the self control to wait six months until Christmas and I was so pleasantly surprised! Not only did my daughter take to them immediately but they are gorgeous and simultaneously strong enough to really hold but easy enough to separate that they didn’t pinch fingers or cause frustration for my four year old. Mama got a real zen vibe from putting them all back together in rainbow order at bedtime! So soothing. Definitely pleased with the selection in the mega pack and interested to see what we build with these.