Installation:
Extract the folder(s) of this rar to <steamfolder>/steamapps/<account>/<game>/<game abbreviation>/

Example: c:\documents\steam\steamapps\kevin1337\counter-strike source\cstrike\
         c:\documents\steam\steamapps\kevin1337\team-fortress 2\tf\


To play on them, start up your game and then select "create game", "host local" or whatever similar option
there is from the main menu. You'll be prompted a window where you can choose which map to play.
Alternatively, you can use the ~ key* to bring up the developer console and then type "map" and the name of
the map you want to load, like

map "aim_leetcrew_remix"



Have fun!




* the key left of 1 and above tab. You might have to enable the option of opening your console first. Do this by
bringing up the options menu, clicking on "keyboard" and then, in the keyboard tab, on "advanced".