Arcade Mode is one of several different Game Modes found within the game outside of Story Mode. Here, the classic arcade experience has been recreated, with players going through a gauntlet of opponents. If you keep winning battles with your fighters, then you will keep moving forward through more and more foes. At the end of the gauntlet is the Final Boss, where an epic showdown of strength and skills will occur.
There will be exactly five battles with varying tag teams that you must face. After defeating each team in a row, you will face the Final Boss of Arcade Mode in your sixth and final battle. The Final Boss will be the same character you face at the end of Story Mode, Ultron Omega, and he'll be just as tough to defeat in Arcade Mode. By completing Arcade Mode, you will earn Alternate Character Colors/Skins for the fighters you used. Arcade Mode can be challenged as many times as you would like.