>>719756518
Unmarked secret: locked-room mystery
When thinking about secret design in Metroid Fusion, one quote from Sherlock Holmes comes to mind:
>“Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth.”
Fusion probably has the most unmarked secrets on the critical path compared to every other Metroid game. This is because Fusion switched to a more linear, controlled environment, which allowed the developers to be a lot more deliberate in their secret design, as the players HAD to find them to progress.
Yet no needle in haystack issue: everytime you need to find an unmarked secret, you are usually confined to a few couple rooms, limiting your options. Sometimes locking you to less than a room's space.
This is sometimes taken to an extreme. Please take a loot (or not) to "the Completionist" getting stuck in a 12-tiles wide alcove for 5 full minutes.
https://youtu.be/lYgqs3f47GE?list=PLm8aFRzVGLtQi6yT3GISqqhgGFwWL5vP6&t=1376