Advent of Code 2016 solutions Day Name Ruby 01 No Time for a Taxicab Solution 02 Bathroom Security Solution 03 Squares With Three Sides Solution 04 Security Through Obscurity Solution 05 How About a Nice Game of Chess? Solution 06 Signals and Noise Solution 07 Internet Protocol Version 7 Solution 08 Two-Factor Authentication Solution 09 Explosives in Cyberspace Solution