| Some Stupid Quests (ver. 2) | Kuddy ◪ | 2010-01-15 |
| 105 |
| Stargate | Lachesis ◪ | 2011-09-21 |
| 76 |
| Spooky Boi | LogiCow ◪ | 2020-10-10 | No reviews. | 84 |
| Smiley RPG | Mallo | 1997-12-23 |
| 239 |
| Sid's Quest (Incomplete) | MattSplatW ◪ | 2006-10-29 | No reviews. | 74 |
| Starforce: Space Adventure | MegaKev | |
| 15 |
| Sivion (unfinished) | Monthigos ◪ | 1997-10-27 |
| 143 |
| Sivion Preview | Monthigos ◪ | |
| 113 |
| Sivion Demo II | Monthigos ◪ | |
| 125 |
| Sprite Catcher | Nanobot ◪ | 2002-09-29 |
| 89 |
| Saga of Dan Demo | Nash ◪ | | No reviews. | 99 |
| Spoder Road | Nemesis^ | 1997-07-23 |
| 94 |
| Sudoku Simulator | nooodl ◪ | 2009-06-03 | No reviews. | 106 |
| Shooting Game Demo | Nytar ◪ | 2006-12-16 |
| 98 |
| Sacred Gem Demo | Pancake ◪ | 2006-05-29 |
| 96 |
| Secret Demo | Pancake ◪ | 2006-07-17 |
| 86 |
| Shocked Demo | Pancake ◪ | 2006-07-22 |
| 84 |
| Serrated Episode Zero: Confrontation | Pancake ◪ | 2006-06-14 |
| 87 |
| Stuff | paulguy ◪ | 2004-10-02 |
| 69 |
| Shock and Awe and a Whimper | pbl.fyi ◪ | 2017-04-26 | No reviews. | 50 |
| Some | RakiSoft | |
| 87 |
| Slider Puzzle | RatoN ◪ | 2005-06-06 | No reviews. | 91 |
| Silent Death Demo | Razerboy ◪ | |
| 79 |
| SaintZZT 7th DX (ver. 1.2) | RinGames ◪ | 2014-12-31 | No reviews. | 84 |
| Starflight Mzx Combat Demo (ver. 1.52) | Risu2112 ◪ | 2019-01-13 | No reviews. | 90 |
| Starflight MZX (Project Dump) | Risu2112 ◪ | 2019-01-28 | No reviews. | 108 |
| Scribbit's Mini Game | Scribbit | |
| 116 |
| Shloober Stockpile 1: ClockTower | ShloobeR ◪ | 2008-01-01 | No reviews. | 74 |
| Shloober Stockpile 2: BrainFart | ShloobeR ◪ | 2008-01-01 |
| 67 |
| Stair Dismount | Slinky ◪ | |
| 104 |
| Space Station (demo) | Sonic1126 ◪ | 2000-03-29 |
| 83 |
| Space Station 2: Planetary Warp (demo) | Sonic1126 ◪ | 2000-08-21 |
| 95 |
| Sonic's Quest | Sonic64 | |
| 95 |
| SpellWeavre | SpellWeavre ◪ | 1997-01-19 | No reviews. | 43 |
| Super Zero 2 | Static76 | |
| 144 |
| Super Zero | Static76 | | No reviews. | 104 |
| South Park Demo | Stewart Fullerton & James Greenwood | |
| 86 |
| Super ADVenture: The Journey Home (ver. 2.3) | STRIKESOFT | 1996-01-27 |
| 94 |
| Ski 2004 | Switchblade ◪ | |
| 82 |
| SK8 2004 Demo | Switchblade ◪ | |
| 79 |
| Squirm Wars 2 (Demo) | T-Bone ◪ | 2006-06-17 |
| 89 |
| Super Mario Miniatures Demo | T-Bone ◪ | 2006-06-20 |
| 133 |
| Super Mario for MZX Demo (ver. 1.26) | T-Bone ◪ | 2006-12-03 | No reviews. | 212 |
| School Sucks Demo | Teevee | |
| 104 |
| Spirit Quest (ver. 2.0) | ThDPro ◪ | 2012-07-24 | No reviews. | 128 |
| Silence in the Theater | ThDPro ◪ | 2012-08-03 | No reviews. | 114 |
| Star Trip | Thundercloud ◪ | |
| 81 |
| Shadowsong | Tixus/Esdemo1/Quasar84 | 2002-07-06 |
| 273 |
| Shadowsong 2 Demo | Tixus/Esdemo1/Wervyn | |
| 81 |
| Smiley Knights | Triterra | |
| 80 |
