| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Under Cover of Darkness | Christopher Huang | 2000 | English | Solution, Map |
| Unfortunate Training of Frank Lee, Monkey Butler to Be, The | Josh Giesbrecht | 2001 | English | Solution, Map |
| Unity! | Greg Ewing | 1998 | English | |
| Untitled | Mark J. Musante | 1998 | English | |
| Upwards | Sam Kabo Ashwell | 2005 | English | Solution, Map |
| Upwards and Onwards | David Jacob Wildstrom | 2003 | English | Solution, Map |