Nataku92 sent us an email announcing a new version of his top-down Counterstrike homebrew game for the PSP, known as CSPSP. As CSPSP v1.55, the game now has support for 3.xx firmwares, which means you should be able to run this on the PSP Slim. Unfortunately, it only has support for 3.xx custom firmwares now, so you might have to upgrade your CFW to use this homebrew.

Here's the full list of updates and changes as listed on the forums:

• 3.xx firmware support (haven't tested on slim, but it should work)
• Fixed server list (hopefully)
• Fixed bug where only part of the server list is downloaded.
• Redid a lot of the networking and added client-side prediction to make online play smoother and less buggy
• Automatic map downloads when connection to servers
• Made the scoreboard only show the top 4 players in each team
• Music reimplemented (but causes some lag)
• Chat now shows if the person is dead/spectating
• Added more sounds (walk, ricochet, pickup, ammo, hit, knife hit, die, ct win, t win, round draw)
• New update system
• Just fixed another small bug where auto balance would mess up count of remaining players on each team for a round.
• I fixed a small issue in the server application where it would freeze on trying to send a map.

From the notes on our forums, it seems this application is quite popular, so you should be able to find someone to play with if you check the forum link below. That being said, feel free to download the app and enjoy!

Download: CSPSP v1.55
Visit: QJ.Net PSP Development Forums