At first glance, it’s just a grid. Three rows, three columns, nine numbers—or almost. But there’s one spot left blank, and it’s begging for your attention. This viral number puzzle is making the rounds online, and people can’t agree on the answer. Some say 8, others shout 12, and a few confidently argue for 3.

So what’s the truth? Let’s dive in and break it down step by step, with logic, patterns, and a pinch of brain gymnastics.

The Puzzle Setup: What Are We Looking At?

Here’s what you’re working with:

Your mission: Find the missing number in the bottom-left corner.

Sounds easy, right? But as with most great riddles, the simplicity is deceptive. This isn’t just a test of math skills—it’s a test of perspective.

First Instinct: Vertical Columns

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Naturally, most of us start by scanning the columns. Maybe there’s a pattern running top to bottom?

Let’s test that theory:

Column 1:
2 → 4 → ?

Seems like a doubling pattern:
2 × 2 = 4
4 × 2 = 8
So maybe the missing number is 8?

Don’t get too comfortable.

Column 2:
6 → 20 → 21
That’s a jump of +14, then just +1. No consistent increase.

Column 3:
18 → 100 → 147
That’s a jump of +82, then +47. Again, totally uneven.

So while column 1 gives us a solid guess, the other columns fall apart quickly.

Next Step: Horizontal Rows

When vertical doesn’t work, it’s time to look across.

Row 1:
2 → 6 → 18
Now that’s something!
2 × 3 = 6
6 × 3 = 18

That’s a clean ×3 pattern across the row.

Row 2:
4 → 20 → 100
4 × 5 = 20
20 × 5 = 100

Now we’re seeing a progression.

Let’s Test Row 3:
? → 21 → 147

147 ÷ 7 = 21
So, 21 ÷ 7 = 3
That means the missing number is 3

Boom. There it is.

The Real Pattern: Odd Multipliers in Action

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Take a step back and observe the pattern again:

• Row 1: Multiply by 3, then by 3 again
• Row 2: Multiply by 5, then by 5 again
• Row 3: Multiply by 7, then by 7 again

Odd numbers increasing by 2 each row—3, 5, 7. Simple, elegant, and brilliantly hidden.

It’s easy to miss if you only look down. The trick? Look across and think in terms of progression.

Why This Puzzle Works So Well

It’s not just about math—it’s about how you approach math. The reason this riddle stumps people is because we’re conditioned to read things vertically or follow a basic arithmetic pattern. But this one rewards lateral thinking.

And it teaches an important lesson: don’t always follow the path that looks obvious. Sometimes, the solution is just a 90-degree turn away.

Common Wrong Answers and Why They Miss the Mark

Some people say 8 because they follow the doubling in column one without checking the other rows.

Others guess 12 thinking there’s an additive or mixed pattern.

But those answers break down when tested across all rows. Only 3 fits cleanly into the row logic—and that’s what makes it the true answer.

What Makes This Riddle So Addictive

It’s just numbers in boxes, right? But it grabs your attention because:

• It feels solvable
• It gives you that “Wait, what?” moment
• And it ends with an aha! that’s genuinely satisfying

This is the kind of puzzle that turns into a group challenge. One person gets it, another argues, a third notices something different—and suddenly everyone’s hooked.

Conclusion: The Missing Number Is 3

So what’s the final answer? 3.

It completes the row using the ×7 pattern:
3 × 7 = 21
21 × 7 = 147

It’s a perfect sequence that fits with the overall logic of the grid.

But more importantly, this little math riddle teaches you to pause, reassess, and think differently. And in a world full of problems that seem too big or too weird, that’s a pretty handy skill to have.

So, did you get it before the answer was revealed? Or were you off in multiplication land? Either way, now you’ve got a killer puzzle to share at your next coffee break. Let’s see who really pays attention.