Upon first launch, press Ctrl + C (or go to Options → Input Config). Standard mapping:

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NARUTO SHIPPUDEN: Ultimate Ninja Blazing MUGEN is a testament to the passion of the anime gaming community. It serves as a digital museum, preserving the visual legacy of a beloved mobile game while offering a completely fresh, action-packed gameplay style. Whether you are a competitive fighting game enthusiast or a nostalgic Naruto fan looking to unleash a Perfect Susanoo or Rasengan once again, this community project provides an accessible, deeply customizable experience completely free of charge. To help you get started with this project, tell me: Share public link

Every character features a standard set of light, medium, and heavy physical attacks. By building up your Chakra bar (traditionally the Power gauge in MUGEN), you can unleash specific Ninjutsu. Inputting specific directional commands allows you to execute map-wide Secret Techniques, such as Sasuke’s Indra’s Arrow or Naruto’s Super Ultra-Big Ball Rasenshuriken. Balanced Combat Engine

That’s Blazing Mugen .