| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Inevitable | Kathleen M. Fischer | 2003 | English | |
| Inquisitor | Andreas Schreiner | 2003 | German | |
| Internal Documents | Tom Lechner | 2003 | English | Solution |
| Invisible Argonaut, The | Jacqueline A. Lott | 2003 | English | Solution, Map |
| Island of Infinity, The | Alex Freeman | 2003 | English |