Ar tonelico Qoga: Knell of Ar Ciel is a role-playing game developed by Gust for the PlayStation 3. It is the third and final installment in the Ar Tonelico series and takes place in the third tower of Ar Ciel, in the Reyvateil-ruled country of Clustania, located in an area known as Sol Cluster.

Ar tonelico: Melody of Elemia is a role-playing game developed by Gust for the PlayStation 2. It is the first installment in the Ar Tonelico series and takes place in the first tower of Ar Ciel, the Tower of Eoria, in the former nation of El Elemia, with the Reyvateil Shurelia as its administrator.