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If 1st type is distinct from 2nd type (as it should be), then 1st type does not necessarily have anything to do with intermission screen tally.
'''Secrets''' 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 secret (or "hidden") area may be any number of sectors, but for proper operation of the stats will normally contain only one sector with type 9. Some [[source ports]] use the type 9 sector to trigger an announcement such as "<small>A SECRET HAS BEEN REVEALED</small>" and to play a sound, but the original game does not give any indication until the [[intermission screen]].
