This puzzle cube is known as the 'Master'. 4x4 cube master puzzle toy is the next level up from the 3x3 cube. Zone C - AB31-38, AB40-56, IV, KW1-14, PA21-38, PH4-41, PH49-50 & Northern Ireland(BT). Zone D - HS, IV41-49, IV50, IV55&56, KA27-28, KW15-17, PA20, PA41-49, PA60-78, PH42-44, ZE, Isle of Man & Channel Islands.
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