It is important to clarify a key technical reality before proceeding: There is no official, commercial version of Counter-Strike (1.6, Source, or Global Offensive) released by Valve or Sierra for the PlayStation Portable (PSP).

Extract the Files: The download is usually a .ZIP or .RAR archive. Extract it to your desktop using WinRAR or 7-Zip.

  1. Ensure your PSP is connected to the internet.
  2. Go to the PS Store icon on your PSP's home menu.
  3. Search for "Counter-Strike" in the store's search function.
  4. Select the game from the search results, and then choose the "Download" option.

Step 3: Launch the Game

  1. Turn on your PSP and ensure you are running Custom Firmware (check System Settings for "PRO" or "ARK").
  2. Go to the Game section on your PSP’s XMB (home menu).
  3. Scroll down to Memory Stick.
  4. Look for the Counter-Strike Portable icon (often a CS logo or a generic blue icon).
  5. Press X to launch.

Counter-Strike Portable (Quake Engine Mod): For those wanting a 3D first-person experience, this version uses the Quake engine to recreate CS 1.6-style maps and mechanics. How to Download and Install

Step-by-Step Guide: PSP Counter Strike Download and Installation

Warning: You need a "Custom Firmware" (CFW) PSP (like PRO-C or LME) to run homebrew. OFW (Official Firmware) will block these files.