In 1995, Microsoft tucked a first-person, Doom-like game inside Excel 95 to credit its developers. Three decades later, the hidden Hall of Tortured Souls still runs, if you know how to get it running. Here's how to set up a virtual machine and unlock it yourself.
How-To Geek
Microsoft hid a DOOM clone in Microsoft Excel 31 years ago: here's how to play it today
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