To unlock and play as Ada Wong in the “Separate Ways” mode of Resident Evil 4, you need to follow these steps:

1. Complete the Main Game: First, you must successfully finish the main Resident Evil 4 game on any difficulty level. This step is essential as it is a prerequisite for accessing the Separate Ways mode.

2. Unlock the Separate Ways Mode: After completing the main storyline, the Separate Ways mode will be unlocked. It can be found in the “Extras” section of the main menu. Initially, it won’t appear on the main screen until you finish the main story.

3. Accessing the Mode: Go to the Extras menu and select Separate Ways to start your journey as Ada Wong. This mode provides a unique perspective on the events of the main game, highlighting Ada’s missions that run alongside Leon’s.

4. Explore Ada’s Storyline: Enjoy the gameplay and narrative that showcases Ada Wong’s experiences and objectives, adding depth to the overall story of Resident Evil 4.

5. Unlock Additional Content: Completing the main game also unlocks several extras in the Separate Ways mode, including Ada’s various outfits such as her Dress and Undercover Outfit. Furthermore, defeating the game on your initial playthrough grants access to Professional Mode, which provides even more costumes and bonuses related to characters like Luis and Wesker.

Summary of Steps:
– Finish the main Resident Evil 4 game.
– Navigate to the Extras menu.
– Select Separate Ways to experience Ada Wong’s perspective.
– Unlock additional outfits and Professional Mode content post-completion.

Following these steps will allow you to fully enjoy the Separate Ways DLC featuring Ada Wong, enriching your Resident Evil 4 experience.