House of anubis (de) path of the 7 sins (2012)

On a schooltrip, Daniel finds an antique shop where he gets a ring that he gives to his girlfriend Nina, a ring that proves his endless love for her, then a magical gate opens to a fantastic medieval world. Nina is kidnapped by the creepy knight Roman and Daniel and his friends follow them through a magical portal. They embark on the dangerous "Path of the 7 Sins" to save Nina. There are dangers and seven difficult riddles of the 7 deadly sins.