1.Setup
Fully covert the line of sight of your computer or phone screen with a thick cardboard in a way you can't see what is displayed.
2.Calibration
Listen the audio to know which shape is displayed on the screen. Take as much the time you need to get a feel of it. Cycle back and forth between the 2 shapes to increase your feelings of them.
3.Practice
Practice sessions last 10 rounds. Guess with your mindsight which shape is displayed.
4.Score
Look at your result.
