For seasoned Clever players and others looking for a challenge, there is now Clever to the 3rd Power: Challenge 1! These additional score sheets for Clever to the 3rd Power differ from the sheets of the original game. The game rules are otherwise the same, but must now be used on a score sheet that works slightly differently. For example, the layout of the yellow and blue-green category has been completely changed and in the blue category you must now take into account the plus and minus signs that run through each other.