Counter-Strike is one of the most popular first-person shooters in existence. In fact, Counter-Strike 2 peaked at 1,862,531 simultaneous players on April 12, 2025, a record for concurrent players on the platform. Despite the game being years old and only being refreshed with minor tweaks, it is still one of the cornerstones of FPS gaming and is incredibly revered among gamers in general.
Which is why a group of modders at PocketJS has been working to bring Counter-Strike to the PlayStation Portable, a console with its own dedicated niche in the gaming community. PocketJS has successfully released OpenStrike, which is an open-source first-person shooter that is designed to run on the original Sony PSP hardware. This Counter-Strike “clone” brings CS-style gameplay to the portable console with tremendous accuracy and is a big win for the modding community.
PocketJS posted on X a video of the game being played and tested live on the PSP, apparently with DevTools open. One can clearly see the console running the game smoothly, and the visuals match the original really well. Admittedly, I’m not an avid CS player, but my untrained eye will have a difficult time telling one from the other in a blind test. Apparently, OpenStrike uses the same classic maps, bots, tracers, recoil, and other gameplay mechanics.
On to the technical details, the developers claim that the game is running at a locked 60 FPS on the PSP, with a fully open JavaScript mod API. The key highlight is that they estimate a roughly 12MB RAM footprint for the game on the PSP, which is impressive. The handheld is running at 333 MHz, on its native 480 x 272 resolution. OpenStrike is fully open-source and reportedly runs on the original PSP-1000.
Under the hood, the engine uses Rust for bot logic, collision, movement, and rendering, with the embedded QuickJS engine being used to run the full HUD and scoring systems using TypeScript and JavaScript. The developers also use clever workarounds to make sure that the PSP runs the game smoothly without encountering bugs. Lighting is reportedly baked into vertex colors, while the renderer avoids processing unseen geometry too.
It must be mentioned that OpenStrike is not a port of Counter-Strike, but rather an open-source alternative built to run on the PSP. The game does not use Valve’s copyrighted maps or other materials, but it looks quite familiar nonetheless. Currently, version 0.1 is a technical project rather than a complete multiplayer experience, and has quite a few missing features. However, it is a very good proof of concept and a modding achievement nonetheless.
Players who want to try the open-source project for themselves can access it as a PSP EBOOT for homebrew-enabled systems. OpenStrike can also run through the PPSSPP emulator. In any case, the player must provide their own compatible BSP and WAD files.
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[PC Hardware Specialist]
Usman Saleem brings 8+ years of comprehensive PC hardware expertise to the table. His journey in the tech world has involved in-depth tech analysis and insightful PC hardware reviews, perfecting over 6+ years of dedicated work. Usman’s commitment to staying authentic and relevant in the field is underscored by many professional certifications, including a recent one in Google IT Support Specialization.
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