| Title | Description | Size |
| Ntrok | Homebrew game for PSP based on KTron. | 1 MB |
| Nuke The Wha | Homebrew game for PSP. | 3 MB |
| NumberSet PS | Puzzle game for PSP. | 292 KB |
| Numeros | Homebrew game for PSP. | 2 MB |
| Numpty Physi | PSP version of the indie game. | 728 KB |
| NyanCat Mod | NyanCat Mod of Platform Portable. | 874 KB |
| O.T.T.F. | Puzzle game for PSP. | 4 MB |
| Obstacle | Simple dodging game for PSP. | 8 MB |
| OceanPop | Homebrew puzzle game for PSP. | 14 MB |
| Odyssey For | Homebrew game for PSP. | 3 MB |
| Old Miner | Homebrew game for PSP. | 2 MB |
| OMGWTFOTL | PSP port of Odious Manly Genuflection With Terrible Fury: Only T | 28 MB |
| Open Gladiat | Homebrew game for PSP. | 4 MB |
| Open Mugen P | Version of Mugen for PSP. | 2 MB |
| OpenBOR | Game engine for PSP | 11 MB |
| OpenBricks | Tetris for PSP. | 2 MB |
| OpenHCL | A fanmade port of E. (Buster) Hashimoto's Hydra Castle Labyrinth | 9 MB |
| OpenLara | Game engine for Tomb Raider. Data files from the original PlaySt | 3 MB |
| OpenRPG | Homebrew game for PSP. | 1 MB |
| OpenSupaplex | Open-source version of the original game. | 12 MB |
| OpenTTD | PSP port of the open-source game. | 93 MB |
| OpenTTD PSP | PSP port of the open-source recreation of Transport Tycoon Delux | 21 MB |
| Optique Memo | Homebrew game for PSP. | 8 MB |
| Orbid | Homebrew game for PSP. | 4 MB |
| Orbz | Homebrew game for PSP. | 3 MB |
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