If you're up for a good 'o game of multipayer CS game yet are not in the mood for a PvP game, this is the game for you.
User Rating: 9 | Counter-Strike 1: Anthology PC
This Steam bundle includes much of what you have probably already owned back in the original Counter Strike package. Much of the Half-Life mod games are still included, with the original maps made by Valve retouched for the Condition Zero version along side with the Original version of the game. This is probably the best starter version for novices (little kids) since it includes difficulty settings for beginners, with four levels ranging from Easy to Expert. Every level (or maps) in the Condition Zero single player mode prompts the player to execute different tasks such as flanking a certain number of enemies during that round or to kill a number of enemies with a certain type of weapon.
As an experienced Counter Strike player I don't see much difference between this and the original 1.6 version of Counter Strike other than the fact that most of the original maps are re-touched and the new addition of built-in bots. For $20 this game is more than worth it. Additionally, I don't have to tell you how influential and classic Counter-Strike is for any FPS players. Condition Zero is definitely your go-to version when you feel like playing a multi-player game yet do not feel like playing against other players. 
