Playing the N-Back test is straightforward but requires focused attention. Watch the 3x3 grid as blue squares appear in different positions. Your task is to remember the sequence and identify when the current position matches the one from N steps ago. For a 2-Back test (the standard version), you need to determine if the current square's position matches the position from 2 steps earlier. Click 'Match' or press the spacebar when you detect a match, or click 'No Match' or press 'N' when there's no match. Each stimulus is displayed for 3 seconds, followed by a 1-second interval. Stay focused throughout the entire sequence to achieve the best results.