How do you play arcade mode on marvel Ultimate Alliance?

You can't play "Arcade Mode" in the classic Marvel Ultimate Alliance games (Marvel Ultimate Alliance and Marvel Ultimate Alliance 2). There is no specific mode with that name in those games.

However, the games do have a very similar mode that you might be thinking of:

Story Mode:

* This is the main mode of the game where you follow the story and play through different missions. It's the most comprehensive way to experience the game.

Challenge Mode:

* This mode provides you with different challenges and objectives within the game. You can choose from a variety of different challenges, ranging from defeating specific enemies to completing missions within a time limit.

Other Possibilities:

* You might be thinking of a different game, like "Marvel Ultimate Alliance 3: The Black Order" for the Nintendo Switch, which does have an "Arcade Mode."

* Or maybe you're referring to a fan-made modification or a custom mode created by the community.

To clarify, if you're looking for a specific "Arcade Mode" in the original Marvel Ultimate Alliance games, it doesn't exist. You can, however, enjoy the Story Mode and the various challenges offered in Challenge Mode.