| Title | Company | Year | Language | Documents |
|---|---|---|---|---|
| Strange Submarine | Chaotic Soft, MilousSoft | 1990 | Czech | |
| Stalker | Zenobi Software |
1990 | English | |
| Spellcasting 101: Sorcerers get all the Girls | Legend Entertainment |
1990 | English | Solution |
| Spectre of Castle Coris, The | FSF Adventures | 1990 | English | Solution |
| Spaced-Out | Simon Avery |
1990 | English | Solution |
| Soho Mission | Daren Pearcy | 1990 | English | |
| Ski Adventure | PDPD Software | 1990 | German | |
| Sherlock Holmes: The Lamberley Mystery | Zenobi Software |
1990 | English | Solution |
| Sheriff of Grisly Gulch, The | CGH Services | 1990 | English | |
| Senor del Dragon, El | Grupo Creators Union | 1990 | Spanish | |
| Sefton Manor Assignment, The | Adventure Club, The | 1990 | English | Solution |
| Sabat of Milton Gordon, The | Adventure Club, The | 1990 | English | Solution |