Brain teasers often look simple at first glance, but the best ones hide a small twist that catches people off guard.

This puzzle is a perfect example.

Most people answer it within seconds—and most people get it wrong.

Let’s see if you can spot the trick.

The Puzzle

A handwritten note asks a simple question:

What is the next letter?

A B C D ??

Then it adds an important clue:

“It’s NOT E.”

At first, this seems strange.

After all, the alphabet clearly goes:

A, B, C, D, E…

So why would the note specifically tell us that E is not the answer?

That’s where the puzzle gets interesting.

Why Most People Get It Wrong

When we see a familiar pattern, our brains often switch to autopilot.

The moment most people read:

A B C D

they automatically think:

E

without paying much attention to the extra instruction.

The puzzle is designed to test whether you are actually reading all the information or simply relying on habit.

The clue changes the rules.

And once the rules change, the obvious answer is no longer correct.

Looking at the Clue

The note doesn’t ask:

“What normally comes after D?”

Instead, it asks for the next letter while clearly stating that:

E is not the answer.

That means we must continue the sequence while skipping E.

If E cannot be used, we simply move to the next available letter.

The Correct Answer

F

Here’s why:

The normal alphabet sequence is:

A, B, C, D, E, F…

But the puzzle tells us that E is not allowed.

So after D, we skip E and continue to the next letter.

That letter is:

F

Simple Breakdown

• Alphabet sequence: A, B, C, D, E, F
• The puzzle says E is not the answer
• Skip E
• The next valid letter becomes F

Answer: F

Why This Riddle Is Clever

The puzzle isn’t testing your knowledge of the alphabet.

It’s testing your attention to detail.

Many people see the sequence and immediately answer E without considering the extra instruction.

The clue exists specifically to prevent that answer.

Once you pay attention to the condition, the solution becomes surprisingly simple.

Final Takeaway

This riddle works because it tricks the brain into following a familiar pattern.

Most people focus on the alphabet and ignore the hint.

But the hint changes everything.

Since E is ruled out, the next valid letter is:

F

Sometimes the hardest puzzles aren’t about finding a complicated answer—they’re about noticing the information that’s right in front of you.

Note: All images used in this article are AI-generated and intended for illustrative purposes only.