CS 1.6 Portable is a compressed version (just 64 MB) and does not require installation of the famous Counter-Strike 1.6. Just download and play, with all features included.
It is a great option for those who are looking to remember this classic game, without wasting time with installation, or still don't want to leave traces of the installation on the PC. After downloading the file, just uncompress it and run the exe file, contained in the folder. There, the usual CS 1.6 is at your disposal.
Despite the reduced version, all the features of the good old Counter-Strike are available. You can play online without the need to download any patches for this. If you choose to play offline, bots are also included.
Play at school, at work, or anywhere else, taking on a mobile storage device.
In short, this version is ideal for those who are looking for speed to play, so you probably haven't read this far.