2017-2019[]
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Seen in Entropy: Zero.
2019-present[]
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Used since 2022's Entropy: Zero 2, first being seen in the preview of its first and second chapters.
Entropy: Zero
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A series of mods set in the Half-Life/Portal universe, owned by Valve Official trilogy: Entropy: Zero | Entropy: Zero 2 | Untitled third installment Fan spin-offs: Entropy: Zero - Uprising | Entropy: Zero - Uprising - Episode Two Winner of 1 Mod of the Year |