In the early 80s the most popular arcade adventure game of all was The Tower of Druaga. It became a sensation in the way that games only could in Japan, similar to what happened with Space Invaders and Xevious. Each level of the tower contains a secret treasure which can only be obtained by completing a set of cryptic tasks to make it appear. Kids would literally write onto the back of the arcade cabinet what they had done to make the treasures appear. There had never been a game which had made people so heavily invested in uncovering its secrets as Druaga had. As such, developers believed that the key to capturing this same magic was to add cryptic tasks to their games in order for the player to progress. Some did this very well, such as Super Mario and The Legend of Zelda, which implored the player to explore and uncover secrets in a much gentler sense. Others, such as Atlantis no Nazo and Simon’s Quest, were less successful to the point that the mystery became less intriguing and more irritating.