Here's what you likely have in mind:
* The "Level 4 Movie" is a placeholder for the level where you can access the "Springfield Heights Movie Set" which is a key location in the game for missions and collectibles. This location is unlocked after completing a certain number of missions, likely in the early game, around level 4 or 5.
* The game features a mission called "The Movie Set" where you have to help Apu find his lost film reel. This mission will lead you to the "Springfield Heights Movie Set" location.
Here's how to get to the "Springfield Heights Movie Set" location and access it:
1. Progress through the main story missions. The movie set is unlocked after completing a few of the early missions.
2. Look for the "The Movie Set" mission. This mission will appear in your mission list once the movie set is unlocked.
3. Complete the "The Movie Set" mission. This mission will take you to the movie set.
4. Explore the movie set! The movie set is full of hidden secrets, collectibles, and even a few missions.
You can also access the movie set without completing the "The Movie Set" mission by simply driving to the location. It is located in the upper-right corner of the map, close to the "Springfield Heights" area.