Have the kids mastered the regular Rubik’s cube? Need something a little more challenging, do they?
Pop on over to eBay and pick up this 4x4x4 puzzle speed cube for only $7.53 with free shipping. Toss that little sucker at ’em and see how long it takes! I know my son and his friends would be ecstatic with this, so I might order a few for Christmas gifts this year.