| Clue | 4-Letter Word |
| Chell's Companion in Portal | |
| Small communist island nation | |
| Brass instrument | |
| Main transportation system for items in Portal | |
| A melody | |
| A large collection of sand in the desert | |
| Comedian Cook | |
| A risky challenge | |
| To have concern for | |
| Promised reward for doing science in Portal | |