What is recorded?
One narrow event
Opening a valid local game-detail page can retain that original game ID as Preview opened here. Looking at a catalogue image, filtering or reading coverage does not set a flag.
No play or progress claim
A preview-open flag does not prove reading, starting, successful loading, completion, skill or enjoyment. No timestamps or game progress are stored.
Your browser only
Flags use one site-specific localStorage key. They do not sync or identify an account. You may remove individual flags or explicitly clear all of them in Manage local flags.
When storage is unavailable
You can browse all games and start a game even when storage is denied or corrupted. A warning explains failed persistence; coverage is not presented as complete play history.