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Ultima Underworld has been source ported to Unity Engine, supports high resolutions and mouse look
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![Amazon.com: Sacred Underworld (PC) [Windows 2000 | Windows Me | Windows XP] : Video Games](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/516673EQRXL._AC_UF1000,1000_QL80_.jpg "Amazon.com: Sacred Underworld (PC) [Windows 2000 | Windows Me | Windows XP] : Video Games")
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Underworld Ascendant by OtherSide Entertainment — Kickstarter
Underworld Ascendant on Steam
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