[KongchangAI]
Unverified50% confidenceFactExact time

The shareware first episode of Doom, "Knee-Deep in the Dead," containing 9 levels was distributed for free, with an estimated 10 to 20 million copies in circulation and approximately 1 million paying users.

1
Sources
50%
Confidence
Long-term
Relevance
9/9/2026
First Seen

Sources

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https://kongchang.com/claim/882868
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curl https://kongchang.com/api/v1/knowledge/claims/882868
MCP
get_claim(id=882868)