On the Subject of 81

Sounds like a misnomer for stage count, if you ask me...

This module presents a 3×3 grid of buttons and a display. The goal of this module is to press certain buttons within said grid of buttons for five stages. Pressing an incorrect button will cause a strike.

To start the module, press any button. Note this button’s position for the next stage. The buttons will light up, each either black or white.

For each stage afterwards, plot the previously pressed button’s position on a 3×3 grid. Then, for each button in reading order:

• If the button is white, shift the entire grid right by one cell, looping over if necessary.
• If the button is black, rotate the entire grid 90 degrees clockwise about the centre cell.

Once all transformations have been completed for a stage, press the resulting button. Note this button’s position for the next stage.

If you receive a strike from this module, the stage number will not reset. You can press any button to continue the module from there.