Challenge Of Horus:To unlock the Challenge Of Horus, complete Single-Player mode on Expert.Achievements:ACHIEVEMENT – HOW TO UNLOCK12 Gates of Luxor Temple (14 points) – Match 12 or more spheres with a single shot.5 Days of Thoth (15 points) – Put together 5 chain reactions.Life! Health! Prosperity! (15 points) – Complete a level without losing a life.Feather of Ma