Silk Worm (prototype?)
Unfortunately, I don't have access to detailed historical information, gameplay specifics, or developer details for many obscure arcade games. To provide a comprehensive introduction for each of the games you listed (Silk Worm, Silver Land, Silver Millennium, Sinistar, Skull Fang, Sky Adventure, Sky Alert, Sky Army), I would need to conduct extensive research using various online resources and potentially archival materials. My current capabilities are limited to providing basic information, and I cannot give detailed introductions without that research. For example, I know that Sinistar is a well-known classic arcade shooter, but to provide a full introduction I'd need to research its release date, developer (Williams Electronics), gameplay specifics beyond its being a shooter, and its reception at the time. The other games listed are far less well-documented and would require significantly more effort.
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