I know the title sounds like a mess, but let me explain:

SIO plays like an old first-person dungeon crawler. Your movements are limited to turning left or right and moving forward or backwards. The catch is that there's no enemies to fight, but rather anomalies to correct.

These anomalies will make the decorations in the walls change. You must spot them and fix them quickly, otherwise it's game over. To win the level, you must find a bizarre stranger several times, who will be hiding in the decorations.