Item Number: UNV30822
Can you remove it? Can you return it? Challenge the brains of the world!
Design that does not seem like a puzzle at first glance. It feels like it's playing music. Designed by Russian puzzle writers Dmitry Pevnitskiy and Kirill Grebnev. 2010 Won the Puzzler's Award for the "World Puzzle Design Competition".
Difficulty 2 stars