This is the best summary I could come up with:

For starters, SteamIDFinder is using the current sale price of every game in your unplayed library, as confirmed by looking at a half-dozen "Pile of Shame" profiles.

Steam and I disagree on whether I've launched and played Baldur's Gate II: Enhanced Edition (I definitely did and was definitely overwhelmed), Mountain, and SteamWorld Dig.

Even if they're not dedicated tools, Steam libraries sometimes end up with little bits of game that you didn't ask for and might never play, like Half-Life Deathmatch: Source.

So nobody I could easily poll had fewer than 25 percent of their games unplayed, and those with higher numbers tended to have bought into bundles, sales, add-ons, and other entry generators.

If you've looked up your own stats and feel surprised, you can keep your unplayed games as a dedicated collection in Steam, and it might inspire you to check out the most intriguing left-behinds.

Play what interests you when you have the time, and if your unplayed count helps you stave off your worst sale impulse buys or rediscover lost gems, so be it.

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