Yo-Kai Watch is an role-playing game developed by Level 5 and published by Nintendo. The game was released exclusively on the Nintendo 3DS in Japan on July 11, 2013, in North America on November 6, 2015, in Australia on December 5th 2015 and finally in Europe on April 29, 2016.
Martyn first played the game's demo for a video to gauge his own and his audience's interest in the game.
Later, he and Kim started a playthrough of the game, which is currently on-going, in a sponsored series by Nintendo. They released the first two episodes of the series on Martyn's channel but then moved the series to the Conquest! channel afterwards.