This is a logical puzzle from Muhammad Zain Sarwar on Puzzle Sphere.

“Real Psychological Puzzle that will Test your Logical Thinking

Only 10% of Participants gave the Right Answer!

Imagine in front of you there are four cards placed on a desk. Each card has a number on one side and a color on the other. The visible faces of the cards show the following:

• 3
• 8
• Red
• Brown

You are given a rule to verify:

“Every card that shows an even number on one side, then the opposite side must be red.”

Puzzle Statement

Your task is to determine which cards you must flip over to check whether this rule is being followed or not.

This question was part of a real psychological experiment.”

(I emphasized the “must” in the puzzle statement in order to limit the number of cards flipped to the minimum.)

See Logical Card Test for a solution.