Each game has a similar structure in which the player traverses a series of themed stages to face off against boss robots, gain new weapons and abilities, then defeat Dr. Wily in a final confrontation. For the first six titles, an extra feature is the "Navi Mode", originally introduced in the PlayStation (Rockman Complete Works) re-releases of the first six Mega Man games. Navi Mode adds helpers that provide game hints if the player is in need of help, revises the appearance of the health and weapon energy meters, and revises the weapon subscreens for the first three games. In addition to these eight games, the Anniversary Collection includes two unlockable arcade fighting games (Mega Man: The Power Battle and Mega Man 2: The Power Fighters), which had a limited release outside Japan. These two titles are similar in gameplay but a bit more streamlined. The battles cut straight to the bosses, who get progressively more difficult with each one defeated. Some of the games in the collection have minor differences compared to their original releases. Several of the NES games have remixed sound. In Mega Man 6, the arranged music is incorrectly mastered and suffers from extensive peaking. In Mega Man 7, an instance of the word "damn" was changed to "darn" in order to maintain an all-ages rating. In addition, the graphics of Mega Man walking away from Wily's Castle are absent from the credits sequence, as the developers were unable to port certain SNES graphical effects. In the compilation's version of Mega Man 8, some of the Robot Masters' voice clips play at incorrect pitches. The PlayStation version of Mega Man 8 is used, as opposed to the Sega Saturn version which included bonus features and additional boss battles. Other unlockable elements in the Anniversary Collection include original art, remixed music, and bonus videos: The PS2 version features the pilot episode of the Ruby-Spears Mega Man TV series, while the GameCube and Xbox versions feature the Mega Man episode of G4's Icons. The Xbox version also includes the first episode of Mega Man NT Warrior (based on the Mega Man Battle Network game series) and the ability to change the control scheme. The PS2 and Xbox versions include some arranged music for the first six games, also originally present in the Complete Works versions.