Tetris as accessibility testbed

The most teachable artefact of the doctoral period. Tetris carries the right complexity for accessibility analysis, with a frame anyone tracks. Used during the PhD as the deliberate falsification test for the framework.

Why Tetris

Six tile types, four orientations, the silhouette-recognition problem at the bottom of the well, the next-tile preview, the held-tile, multi-line scoring, increasing tempo. Everything an accessibility researcher needs to test — vision, audition, motor, cognitive, timing — but with a frame anyone tracks.

You could go to a conference, talk about Tetris, and people understand where you are. Then you start talking about how someone with hand tremors plays it.

Tetris as falsification test

Tetris was chosen not as a teaching example but as the framework’s deliberate hardest test:

What really defeats existing assistive technology is the proximal content inherent in the game — rotating and guiding falling shapes to match gaps on the floor of the grid. If the approach in this research to accessibility is truly better than existing AT, then one would expect to see it succeed in this proximal context.

The thesis depends on Tetris working: a paradigmatically visual, time-pressured, multi-channel game expressed richly enough in audio that the player can play. The audio version that was built — see the Spotlight project page for the seven specific audio metaphors — produced an unexpected observation: the modality shift turned a third-person observational game into a first-person immersive one.

The closure with the Personas appendix

A perfect closure exists in the thesis Personas appendix. From David Furness’s persona — profoundly deaf, protanopic — comes the line: “Even a simple game such as Tetris is a problem on versions with a black background as one of the standard shapes — a long red rectangle is essentially invisible to him.” The very game chosen as the framework’s hardest test fails for the colour-blind user, in a way the standard visual game also fails. The framework exists to handle exactly this case.

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