The Brisbane creator of the world's largest interactive science fiction game said he had to fail miserably before cracking the code of how to make his idea work.

Cryptext, a video game puzzle that requires users to expose an X-Files-style government cover-up, has just opened at The Cube, Queensland University of Technology's science and technology hub at Gardens Point.

Dr Jason Nelson and Matt Horton in front of Cryptext, their giant interactive video puzzle game at QUT's The Cube.

It's the brainchild of "digital poet" Jason Nelson, who was tasked with creating content for a display space eight metres wide and three metres high as part of his QUT digital writing residency.

"The size of the space really made us rethink everything we knew about making digital art or interactive writing," he said.