The three-dimensional puzzle Rubik's Cube that was explosively popular in the early 1980s is staging a big comeback.
Sales of the puzzle, which took Japan by storm 25 years ago, are skyrocketing again in part due to growing interest among Japanese in boosting their brain power.
Reflecting the boom, the Japanese National Championship took place Saturday in Tokyo to select those who will represent the nation in the World Championship to be held in Florida on Nov. 5 and 6.