While "cracked" versions of the retail game exist on various third-party sites, you can legally play a free, standalone version of Black Mesa
You're referring to Black Mesa Source, a popular mod for the classic game Half-Life! black mesa source non steam crack only top
If you're asking about the best or top version of Black Mesa Source outside of Steam, it's crucial to note that the term "top" can refer to several aspects: While "cracked" versions of the retail game exist