| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| I Didn't Know You Could Yodel | Andrew J. Indovina | 1998 | English | Solution |
| In the Spotlight | John Byrd | 1998 | English | Solution |
| Informatory | William J. Shlaer | 1998 | English | Solution |
| Inherit! | Gunther Schmidl | 1998 | English | Solution, Map |
| Innocent Exile | Mat Cooper | 1998 | English |