Oath Demo | Caleb Seibert | 1999-04-18 |
| 83 |
Obelisk Demo | ManofAction ◪ | 1998-03-14 |
| 80 |
Ogre Caves | Skull Games | 2004-01-01 |
| 75 |
Oh No! Not Another Star Wars Parody! | CapnKev | 1996-09-19 |
| 244 |
Oh? | cornsalt ◪ | 2001-01-20 |
| 74 |
Oizys (ver. 1.3) | Lachesis ◪ | 2009-12-25 | No reviews. | 90 |
Old MZX Junk | Evil Genius ◪ | 2016-03-27 |
| 58 |
Old School MZX Demo | shades ◪ | 2003-02-13 |
| 62 |
OMGWTF | RoSS ◪ | 2003-07-14 |
| 76 |
Open Source Demo | gofer-chan ◪ | 2002-04-15 |
| 67 |
Oppo | CHEZZY ◪ | 2007-12-03 |
| 84 |
Orb of the Twisted Demo, The | Legendd | 1997-01-17 |
| 103 |
Ordnance (ver. 1.1) | CJA ◪ | 2014-12-31 |
| 191 |
Outrage | Eon Entertainment | 1996-12-16 |
| 97 |