Groups comparison

Secrets (Secret locations;Secret caches) - 1980 to 2021
Various secret locations are scattered across the levels with possibly helpful but non-vital items or other objects await plundering. Often accompanied with a notice that you've found a secret.

Secrets: Invisible (Undetectable) - 1983 to 2014
Includes secrets that are completely undetectable until discovered, usually by bumping into them accidentally and revealing them.

Mandatory secrets - 1986 to 2020
Player is required to find all or some of the secret locations/caches to progress.

Secrets: Discovered by finding specific spots - 1986 to 2017
Some secrets are accessed by standing in or passing through very specific spot(s). Often spawning rewards nearby.

Harmful secrets - 1987 to 2017
Includes secret locations or similar that are actually more harmful than they're useful.

Disguised triggers(Disguised buttons;Disguised levers) - 1988 to 2022
Includes buttons, levers or other triggers that are disguised to appear as natural part of the environment, such as a book lever in a bookshelf, a push button stone on a stonewall, lever sconce, and so forth.

Secrets: Discover by Falling - 1988 to 2016
Some secrets are located where the player must fall or sink, typically by accident, to discover them. Such falls would seem to risk damage or death.

Secrets: Levels - 1993 to 2015
Hidden levels or similar.

Secrets: Tasks (Secret objectives;Unannounced bonus objectives)[secret tasks] - 2000 to 2018
You can be rewarded for performing certain tasks you are not made aware of before you complete them.

Meta secrets - 2011 to 2018
Includes secrets within secrets.

secrets
secrets-invisible
secrets-mandatory
secrets-spots
secrets-harmful
disguisedtriggers
secrets-falling
secrets-levels
secrets-tasks
80828486889092949698000204060810121416182022 601530450