BrainBall Task 2.1
This is a game of memory where you need to track of the locations of different letters.
Each of these letters is located within one of the four windows.
You may switch in between these windows using the numbered buttons on top.
Your target letter is displayed at top. This is the one you need to find and click.
The better you remember where all the letters are, the more efficiently you will find them, and the better you will score.