A brand new mode titled X Challenge, which is a challenge-based mini-game that allows the player to fight two bosses (Mavericks or Fortress Bosses) from the SNES or PS1 X Games (X1-X6) at the same time.One notable difference is the ability to switch them by pressing a button based on the controller rather than going to an options menu. The ability to switch between the English and Japanese like in Mega Man Legacy Collection and Mega Man Legacy Collection 2.The Day of Σ OVA that was originally part of the Mega Man Maverick Hunter X release is available.The only difference between the English and Japanese releases of the Music Player in this game are the addition of the X4 songs Makenai Ai ga Kitto Aru and One More Chance in the Japanese release.All the music tracks exclusive to this collection are given its own section.Players now have the option if they want to loop through each music track or not, along with the option to loop through all the music tracks for that specific game or the entire collection. Unlike the previous Legacy Collection releases, the music gallery options have been improved.The collections include feature galleries with illustrations, music, videos, and merchandise.In the case of the Switch dual release however, similar to the previous Legacy Collection releases, only this game has a physical cartridge, while Mega Man X Legacy Collection 2 was given a code for a free digital download, similar to Mega Man Legacy Collection 2. This game is also available as a dual purchase for both physical release or a digital bundle pack (excluding the Nintendo eShop) alongside Mega Man X Legacy Collection 2. The game is available for purchase as either a solo purchase in digital format or physical format for the Xbox One, PlayStation 4, and Nintendo Switch that was released in Japan only. It compiles the first four Mega Man X titles.

T Mega Man X Legacy Collection, known as Rockman X Anniversary Collection ( ロックマンＸアニバーサリーコレクション, Rockman X Anniversary Collection ) in Japan, is the third game in the Mega Man Legacy Collection series and is a collection from the Mega Man X series that, alongside Mega Man X Legacy Collection 2, was released for Nintendo Switch, PlayStation 4, Xbox One and PC (via Steam) on Jwhile in Japan it was released on July 26, 2018.

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