At first glance, it looks random.
You see a small grid with three letters:
Top row: A, C
Bottom row: G, ?
Most people try to guess randomly—but there’s actually a clear pattern.
The trick is to look at the alphabet positions.
A is the 1st letter.
C is the 3rd.
G is the 7th.
Now notice what’s happening:
From A → C is +2
From C → G is +4
The pattern is increasing.
So what comes next?
You continue the pattern by adding +6.
G (7) + 6 = 13 → which is the letter M.
That’s the missing piece.
Answer: M
This puzzle works because it looks simple, but your brain doesn’t immediately think in number patterns. Once you see it, though, it becomes obvious.
