Yup, multiple tags are very useful. Accompanied with user-friendly search form it can become very effective search tool. Genres are becoming useless, too many games mix multiple genres and often it's difficult to say which one is primary. More games will become abandonware so sooner or later we'll need such feature. Also similarity-map would be neat cool-looking feature: net-like map with selected game in the center and "similar" games around tied one to another, of course there is a good chance of getting infinity loop but depth limit + stack should do the trick.
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