| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Obituario | Santiago Eximeno | 2002 | Spanish | |
| Objetivo: Madrid - Parte 1 | Galo Alcolea | 1989 | Spanish | |
| Ocaso Mortal | Dhan | 2001 | Spanish | |
| Octavo Pasajero, El | Jarel |
2001 | Spanish | |
| Odisea | Juana Pueblo Soft | 1990 | Spanish | |
| Ofrenda a la Pincoya | Sebastian Armas |
2008 | Spanish | |
| Ojo del Dragon, El | Wazertown Works | 1990 | Spanish | Map |
| Okigoli | Jarel |
2000 | Spanish | |
| Olimpo en Guerra | Eduardo José Villalobos Galindo | 1989 | Spanish | Solution |
| Olvido Mortal | Andrés Viedma Peláez | 2000 | Spanish | |
| Operacion : Operacion | Krac | 2000 | Spanish | |
| Operacion Conquista | Pepsi Soft | 1992 | Spanish | |
| Oraculo, El | Javier De Miguel | 1990 | Spanish | Solution, Map |
| Orco, El | Radastan | 2001 | Spanish | |
| Orfeo en los Infiernos | Xavi Carrascosa |
1997 | Spanish | |
| Orfeo y Euridice | 3PSOFT | 1991 | Spanish | |
| Orion-1 | Kyro Games | 1997 | Spanish | |
| Otras Palabras, En | Aryekaix | 2003 | Spanish | |
| Ouija | Mago soft | 1996 | Spanish |