How to play:
- choose a level (e.g. 2)
- Press MATCH (the button) if and only if the POSITION of the blue square is the SAME as it was $levelNumber (e.g. 2) trials back (the square appears in the same position as it did two trials ago).
- Not pressing MATCH when there is a match will be punished.
- Pressing MATCH when there is no match will be punished.
- You will get a score at the end (each level can have up to 20 matches).