| Title | Publisher | Year | Language | Documents |
|---|---|---|---|---|
| Calliope | Jason McIntosh | 1999 | English | Solution |
| Camping! | Gunther Schmidl | 1999 | English | Solution, Map |
| Carnival | Admiral Jota | 1999 | English | Solution, Map |
| Cave of Wonders | Campbell Wild | 1999 | English | Map |
| Chain of Koschei | Light Future | 1999 | Russian | |
| Chainick: Horror in Flat | Optical Brothers | 1999 | Russian | |
| Chaos | Shay Caron | 1999 | English | |
| Chicks Dig Jerks | Robb Sherwin | 1999 | English | |
| Cloak of Darkness | Roger Firth | 1999 | English | Solution, Map |
| Common Ground | Stephen Granade | 1999 | English | |
| Confessor's Sapphire, The | WoW Software |
1999 | English | |
| Courier Who Missed Me, The | Christopher Huang | 1999 | English | Solution, Map |
| Crystal Ball | Marian Taylor | 1999 | English |