Counter Strike Condition Zero

Counter Strike Condition Zero was released after Counter Strike 1.6 in 2004 using engine Half Life.
Along with the team missions, this game is packed with single player missions.
For example:
Kill an enemy with shield.


This game is almost same to Counter Strike 1.6, the only changes include slight change in graphics & sounds.
Weapon tactics are almost the same.

After Counter Strike Condition Zero, Counter Strike Source was released which had better graphics and better weapon tactics than the first two versions of Counter Strike.