Apr 11, 2013 - Bakos Lucian, iOS developer passionate about puzzles has released one of the most challenging math puzzles - Century Puzzle. Century Puzzle is a very old puzzle from early 1900's made from pieces of colored paper with 6 rings and 36 numbers. Every ring can be rotated individually one at a time. While rotating the rings you will have to add all numbers in single columns and check their sum. The app contains 100 puzzles with the same numbers but with different winning combinations.