Basic Visual Perception Training: Game 3.

Example 1: GAME 3
The task of the player is to recognize a group of two letters out of
6 similar groups. Here he has to find the combination qd.
At the same time he has to avoid touching the moving "billiard-balls".
After each correct answer the letter groups change their position at random.
The player has to find the target group regardless of its position without
touching the "billiard balls".
After a wrong answer the letters remain in their position until the correct
group is clicked at. Wrong answers and touching of the "billiard balls"
result in negative points. There is a total time limit for this task.
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