| Protect and Shell Improvement | Deathlike2 | Final Fantasy II | Role Playing | SNES | GP | Improvement | 1.0a | 18 Dec 2008 |
| Proofreading Fix | HarvettFox96 | Ghostbusters | Action | NES | G, T | Improvement | 2018.07.28 | 28 Jul 2018 |
| Promotion Mario Bros. | Garuna | Super Mario Bros. | Action > Platformer | NES | G, L, T | Complete | 1.0 | 27 Aug 2004 |
| Project ZM | Cosmic | Metroid: Zero Mission | Action > Platformer | GBA | G, S, L, T, GP, O | Improvement | 0.8.2 | 06 Nov 2021 |
| Project S-11 final boss music patch | DevEd | Project S-11 | Action > Shooter | GB | S | Bug Fix | 1.1 | 28 May 2018 |
| Project RE-Quest II - Mobile Script Port and Relocalization | Choppasmith | Dragon Warrior II | Role Playing | NES | G, T | Improvement | 1.12 | 14 Jun 2020 |
| Project RE-Quest - Mobile Script Port and Relocalization | Choppasmith | Dragon Warrior | Role Playing | NES | G, T | Improvement | 1.3c | 19 Dec 2018 |
| Project II: Final Fantasy IV | FlamePurge | Final Fantasy II | Role Playing | SNES | G, T, GP, O | Improvement | 3.03 | 15 Dec 2021 |
| Project Base | begrimed | Super Metroid | Action Adventure | SNES | G, S, L, T, GP, O | Improvement | 0.7.3 | 28 Jan 2018 |
| Probotector / Contra Operation C (Konami Col. Autoboot Hack) | tidi | Konami GB Collection Vol. 1 | Other | GB | O | Improvement | 1.0 | 20 Mar 2018 |
| Probotector - play as robot | Digital Warrior | Konami GB Collection Vol. 1 | Other | GB | G | Improvement | 1.0 | 11 Nov 2019 |
| Probotector (E) Hit Point Restoration Hack | MrNemesis | Contra: Hard Corps | Action > Platformer | GEN | GP | Improvement | 1.0 | 22 Aug 2011 |
| Pro Wrestling FDS title logo on the NES | Kozakurainko | Pro Wrestling | Sports | NES | G | Improvement | 1.0 | 21 Feb 2006 |
| Princess Sarah's World | Gabriel Dinu | Super Mario Bros. | Action > Platformer | NES | G, S, L, T | Complete | 1.0 | 03 Nov 2020 |
| Princess Pipe Panic | Zynk Oxhyde | Mario Bros. | Action > Platformer | NES | G, T | Improvement | 1.0 | 02 Dec 2017 |
| Prince of Persia Restoration | SCD | Prince of Persia | Action > Platformer | SNES | G, T | Improvement | Final | 01 Aug 2017 |
| Prince of Persia No Full-screen Flashes | Жукороп | Prince of Persia | Action > Platformer | NES | G | Improvement | 1.0 | 01 Oct 2020 |
| Prince of Persia FastROM | Linkuei | Prince of Persia | Action > Platformer | SNES | GP | Improvement | 1.0 | 25 Feb 2022 |
| Prince of Persia DOS-like palette | SagePtr | Prince of Persia | Action > Platformer | NES | G | Improvement | 1.0 | 15 Sep 2013 |
| Prince of Persia Brutal Dungeons | GabrielJohn | Prince of Persia | Action > Platformer | SNES | G, L, O | Improvement | 1.0 | 18 Feb 2014 |
