Board Thread:General Discussion/@comment-31615118-20170524193256/@comment-30638141-20170526220924

Andii I did a few posts by the number that gave the numerical skinny on challenges breakdown

Novice          energy 7         keys 5       visits 5   ener bonus  10          35 energy,  25keys

Amateur                  10               10             10                         30        100 energy, 100keys

Connoisseur           13                15             12                        50       156 energy, 180 keys

Sleuth                      16                20             25                      100       400 energy, 500 keys

Detective                 19               25            100                     250? 1900 energy, 2500 keys

Total:   Energy 2591 Keys 3305

This is based on past challenges. So yes, the final level is much more difficult. M.