In Counter-Strike 1.3 Source Engine version, players models were finally upscaled, and with the introduction of the new anti-cheating package in Counter-Strike 1.4, new animations were introduced. These animations were provided by Valve Software in collaboration with Valve's in-house animation team. In Counter-Strike 1.4 the effects of the new ammunition system (the rapid fire weapon animation is disabled unless the player gains a high level of accuracy) are also included. The changes in effects were implemented internally by Valve.
The Counter-Strike 1.5 release introduced some changes that were beyond the scope of the Source engine. The weapons were given a variation in the warp factor, meaning weapons would fire a faster rate of bullets. The slight difference in the animations of the weapons were also introduced in this release. However, these changes were not done internally by Valve.
For the Canadian version of Counter-Strike 1.3, Valve Software included both English and French text with the game, as well as suggested course of action for players. Although these suggestions were not necessary, some of these text messages had technical issues, including illegal use of the word "porch". d2c66b5586