The Loop (Games)
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Secrets in the Doom series can mean several things:
- Areas of a level that are hidden (to some extent). Usually, there is some clue about a secret area, such as an off-color wall that is actually a door. By convention, most levels are designed so that it is not necessary to find any of the secret areas to complete the level. After exiting a level, the percentage of the secret areas found is displayed.
- A special sector type (9), used to calculate the secrets-found percentage displayed at the end of each level. The number of type 9 sectors in the level is the total number of secrets. When a player first enters a type 9 sector, the number of secrets found is incremented by one.
- A linedef flag bit (5). This makes a two-sided linedef appear on the automap in red instead of yellow, that is, just like a single-sided linedef. This is used to hide entrances to secret areas, but has nothing to do with the calculation of the secrets percentage displayed at the end of each level.
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