Ok, according to the list from backloggery.com, the games I consider finished are the beaten games, although occasionally I complete a game since it doesn't take much effort to do it, or it's fun to do it. Like in Assassin's Creed it was fun finding the Templars and sneaking up on them, but looking for flags was dumb (I would collect them only if I stumbled upon them).
I wonder if I ever mastered a game...
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