At first glance, this brain teaser seems simple: just pick the glass with the most water. But take another look. Among the four glasses—labeled A, B, C, and D—each contains a different object, and while they all appear to be filled to roughly the same level, only one actually holds the most water.
So, here’s the challenge: Which glass truly contains the most water?
Is it the one with the scissors? The one with the eraser? Maybe the one with the watch?
Take a good look before scrolling down. Set a 10-second timer and make your best guess.
Got it? Let’s see how your brain stacks up.
Why Most People Choose the Wrong Answer
If your instinct said “Glass A looks fullest” or “The tallest liquid line must mean the most water,” you’re not alone. This is where many puzzle solvers trip up.
Here are a few common mistakes people make:
- They judge by water level alone: That’s the most obvious cue, but not necessarily the correct one.
- They ignore object volume: The bigger the object inside the glass, the more space it takes up—displacing water and making the glass appear fuller than it really is.
- They forget to think critically: Many people rely on quick visual impressions rather than logic, especially in timed puzzles.
These minor oversights are exactly what make this puzzle so effective at revealing how well you truly pay attention to detail.
Step-by-Step Breakdown: Let’s Solve This Puzzle Together
Let’s examine each glass one at a time and break down what’s really going on:
Glass A (Scissors)
This glass appears quite full, but it contains a large pair of scissors—one of the bulkier objects in the lineup. That tool displaces a significant amount of water. So, even though the water level looks high, there’s less actual water because the scissors are taking up space inside the glass.
Video : Which Glass has more water?
Glass B (Paper Clip)
Now take a look at Glass B. It contains only a small paper clip. The water level is slightly lower than some of the others, but the clip takes up almost no space at all. That means most of the volume inside this glass is actual water. If you’re going by pure liquid content, this one’s a strong contender.
Glass C (Eraser)
The eraser is bulkier than the paper clip, but smaller than the scissors or the watch. This glass is somewhere in the middle—not the worst choice, but not the best either. The eraser still displaces a bit of water.
Glass D (Watch)
Finally, Glass D holds a wristwatch, which is a relatively large and dense item. Just like the scissors, it significantly reduces the amount of actual water in the glass. The water may appear full, but a lot of that space is taken up by the object.
So, What’s the Correct Answer?
Glass B is the correct answer.
Despite appearing slightly lower in water level, it has the least amount of object volume inside—just a single paper clip. That means more room for actual water compared to the other glasses.
This is a perfect example of how visual trickery can override logic if you’re not careful. It’s not about how high the water sits—it’s about how much of that space is water, not the object inside.
Why This Puzzle Is More Than Just Fun
Puzzles like this train your mind to:
- Think critically, not reactively
- Analyze beyond first impressions
- Weigh visual clues against logical reasoning
It’s the kind of skill you use in real life too—from reading between the lines in a contract to analyzing visual data or simply making smarter decisions based on more than just appearance.
Let’s Hear Your Answer!
So now it’s your turn:
- Which glass did you pick first?
- Did the explanation change your mind?
- Did you spot the trick right away?
Drop your answer in the comments below and challenge your friends to beat your observation skills. Share this post and see if they fall into the same trap or nail it on the first try!
Video : which coffee cup will fill first ?
Boost Your Brain with More Puzzles Like This
If you enjoyed this challenge, we’ve got plenty more just like it. Spot-the-difference games, logic riddles, hidden image illusions—they’re all excellent for boosting mental sharpness, improving focus, and having a blast while doing it.
Remember, the best way to train your brain is to keep it active and curious. One puzzle a day keeps the brain fog away!
So stay sharp, keep observing, and never stop questioning what you see.
Who knew a paper clip could teach you so much?
