Hard
Chemistry Riddles
22 XP

The Three Utilities

11,547 solved 84% solve rate 16% fail rate
Three houses each need connections to gas, water, and electricity. Can you connect all nine lines without any crossing?
Only 84% solve this correctly
11,547 attempts
Earn +22 XP for solving
Quick Answer & Explanation
No - this is

The answer to this riddle is No - this is. Difficulty: Hard · Solved by 11,547 puzzle lovers.

No - this is the utility graph problem (K3,3). It is proven impossible on a flat plane (non-planar graph).
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