Clumsy Ninja  Clumsy Ninja is an action-adventure video game for iOS and Android, developed and published by NaturalMotion in 2013. In the game the player trains a ninja by having them complete tasks in order to gain experience points. ' Within its first week of release, "Clumsy Ninja" was downloaded more than 10 million times. Gameplay centers around training the ninja and improving their "ninja skills". The player can train the ninja by doing certain activities such as: playing hide and seek, playing on the trampoline, training with a punching bag and many other activities to earn experience (xp). As the ninja improves his skills he earns new belts. Another big part of the game is traveling the country and completing quests, doing so will unlock new items that can be used to further train the ninja, along with more storyline details. "Clumsy Ninja" is the first mobile game to use the Euphoria game engine. The game was originally announced for 'holiday season' 2012, however it was delayed by almost a year. It eventually appeared worldwide on the App Store on 21 November 2013. On release, Clumsy Ninja became the first app to be promoted with a video trailer embedded in the App Store. The game was received with generally positive reviews. Toucharcade gave "Clumsy Ninja" a 3 out of 5 saying: "NaturalMotion has created something very impressive and they clearly want to show off their little ninja and what he can do...". "Clumsy Ninja" has been downloaded over 10 million times.