A successful launch for the smartphone game-based 3DS RPG.

The 3DS Monster Strike game, which launched in Japan this Thursday, December 17, has shipped over one million units as of December 18, publisher XFlag announced.

XFlag notes that this number includes both Japan and Asia, as well as download card and Nintendo eShop sales.

The RPG is based on the popular, free-to-play smartphone physics game with RPG elements. An anime began airing on YouTube in October.

Monster Strike for 3DS was awarded a 33 out of 40 in Famitsu.

Watch a trailer for the game below.