Figure. No caption available.
In each row below, notice how the matrix of dots changes from one frame to the next, and then draw the missing matrix that completes each sequence. How many dots are in the last matrix of each sequence?
This puzzle was adapted from the book The Playful Brain: The Surprising Science of How Puzzles Improve Your Mind, by Richard Restak and Scott Kim (Riverhead Books 2010). For more information, visit theplayfulbrain.com .