Rexaura is a custom modification for Valve's Portal that offers a solo adventure through an alternate version of Aperture Science. It includes 20 new test chambers built around high-energy pellets. Fans of Portal and Portal 2 will find themselves challenged once more, as Rexaura brings in a variety of fresh testing elements that push your portal-based problem-solving skills to the limit. Rexaura is best suited for players who have finished Portal. The puzzles are crafted to be tough to figure out but simple to carry out once the solution becomes clear.
Rexaura follows a player, likely Chell, as she moves through nineteen test chambers, directed by two voices: an Encouragement Core and a Female British AI. The game is set immediately after Portal 1, with the test subject completing puzzles to restore power to a mysterious function whose purpose is revealed only at the story’s conclusion.

| Audio | Subtitles | Interface | |
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| 简体中文 | ✓ | ✓ | |
| čeština | ✓ | ✓ | |
| English (US) | ✓ | ✓ | ✓ |
| Deutsch | ✓ | ✓ | |
| Magyar | ✓ | ✓ | |
| Italiano | ✓ | ✓ | |
| Polski | ✓ | ✓ | |
| Português (Brasil) | ✓ | ✓ | |
| Português (Portugal) | ✓ | ✓ | |
| Русский | ✓ | ✓ | |
| Español (España) | ✓ | ✓ | |
| Svenska | ✓ | ✓ | |
| Türkçe | ✓ | ✓ | |
| українська | ✓ | ✓ |