123ZYK, also known as 123 Resource Library, is a Chinese-language website that organizes and introduces games and selected software. It presents itself as a free, noncommercial personal blog, with no login required and new or updated listings published regularly. Its catalog spans PC games across genres such as action, role-playing, strategy, simulation, racing, horror, puzzles, visual novels, and multiplayer, alongside Switch and mobile games.

Visitors can browse featured releases, popular titles, classic games, highly rated Steam selections, genre collections, and themed series. The site also lists practical software and provides help resources, including installation guidance, advice for resolving startup problems, and information about common runtime libraries. Search tools, popularity rankings, recommendations, and recently updated listings help visitors navigate the collection.

According to its disclaimers, the site gathers resource information from public online sources and does not produce the resources itself; it describes the material as intended for learning, research, and technical exchange. It invites copyright concerns to be reported by email for review and removal