If you look closely, every possible path for the water is blocked.

• Glasses 1 and 5 have blocked outlets.
• Glass 2 is blocked at the end of its pipe.
• Glasses 3, 4, and 7 have blockages in the middle of their tubes.
• Glass 6 isn’t connected to any pipe at all.

Because every route is obstructed, the water has no way to reach any glass.

The Correct Answer

No glass will be filled.

Once you realize this, the solution seems obvious, but most people miss it because they assume the puzzle must have an active result.

Why These Puzzles Work

They rely on two common human tendencies:

• assuming something must happen
• overlooking small obstacles while searching for a quick answer
• Instead of asking where the water will go, the real question is where it cannot go.

A Good Lesson for the Mind

This puzzle reminds us to slow down and observe carefully. Sometimes the most important clue is not what’s visible—but what’s missing.

And now that you know the answer, chances are you’ll want to challenge someone else with it.