An additional level starring Beck's partner, Call, is also available at some point. A final set of stages are unlocked at the end of the game, leading up to the final showdown. At the end of each stage, Beck must face one of the other eight «Mighty» units in a boss battle. The game features an intro level followed by the eight main stages, which are freely chosen in any order by the player. Furthermore, the player is able to acquire both weapons and abilities from enemies they defeat. Players control a robot named Beck, who is able to run, jump, and shoot projectiles at enemies he encounters. 9 is focused on 2D platforming, with a blend of 2D and 3D artwork and animation. The game's design, graphics, content, voice acting, and technical issues were criticized, and critics agreed that the game failed to live up to expectations. The game received a generally mixed reception from critics and Kickstarter backers upon launch.

9 was highly anticipated when it was announced, but lengthy delays and Comcept's decision to fund another project, Red Ash: The Indelible Legend, through Kickstarter were met with accusations of mismanagement. The game was originally scheduled to be released in April 2015, but was delayed multiple times until it was eventually released for Microsoft Windows, PlayStation 3, PlayStation 4, Xbox 360, Xbox One, and Wii U in June 2016, with the PlayStation Vita, Nintendo 3DS, OS X, and Linux versions still in development. However, several other features including additional stages, special modes and ports to other platforms were announced after additional «stretch goals» related to it were achieved, increasing the total funds obtained to over 400% of the original goal. 9 was successfully funded after only two days of the creation of the campaign in September 2013. The minimum Kickstarter goal for Mighty No. 9 closely resembles the early Mega Man series in both gameplay and character design, which project lead Keiji Inafune worked on, and is considered its spiritual successor.

The creation of the game was based on the online crowdfunding website Kickstarter and incorporated heavy input from the public. Mighty No 9 Download Free Full Game is an action-platform video game developed by Comcept, in conjunction with Inti Creates, published by Deep Silver and distributed by Square Enix in North America.

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