Before the widespread adoption of Steam, before the tactical shields of 1.6, and long before the skins of Global Offensive , there was 1.3. This version is legendary for two things: the unhinged power of the with the AWP, and the frantic tactic of "bunny hopping" to escape gunfire.
Since 1.3 predates the modern Steam era, you’ll usually find it through abandonware archives Download Counter Strike 1.3 For Pc