Magingenio I: The Labyrinth of Riddles

Lucas Wizard is the current generation of a long lineage of wizards known as the Wizards of the Light, a team of warriors of the white magic, a part of his life that he doesn't know until the day when unexpectedly he gets his powers.
Lucas is who must defeat the current dark magic leader, Demetrius Dark, and so finish a Magic War that has been active since centuries. To complete his mission, Lucas will must enter in a magic construction called the Labyrinth of Riddles, a series of time trials that replaced the battles, since the years kept coming and no magic force did get the victory.
The common citizens of the white magic, and also the Wizards of the Light, won't have powers until that one of these latter manages to solve the last riddle of the Labyrinth. Every fail means a won battle for dark magic and a lost battle for white magic.