| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| I don't remember why this game is called "Onion" | Dan Shiovitz | 1999 | English | |
| I Never Promised You a Nose Guard | Rob Noyes | 1999 | English | Solution, Map |
| Ice House of Horrors | Sean M. Shore | 2013 | English | Solution, Map |
| In Search of Velocitas Fictus | Jacqueline A. Lott | 2007 | English | Solution, Map |
| In-d-i-go Soul | Jonathan Blask | 2011 | English | Solution, Map |
| Indigo | Emily Short | 2011 | English | |
| Infiltration on Io | Ryan N. Freebern | 2001 | English | Solution, Map |
| Inspiration | David S. Glasser | 2001 | English | Solution, Map |
| Invisible Argonaut, The | Jacqueline A. Lott | 2003 | English | Solution, Map |