Bought this morning and started building immediately. The parts are well made and fit easily but securely. The instructions are easy to follow. There are 4 different types of marbles: glow-in-the-dark plastic, glow-in-the-dark plastic, glass glitter, and regular glass marbles. Everything fits into the black mesh bag that is also included. My 5 year old is already obsessed. Haven't tried the test app yet.
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