A nice development, friend! I liked how you worked in the idea of cheating and switching the backpacks.

Only I didn't understand what exactly happened. It's clear that both mothers decided to teach the boys a lesson, but it's not clear how they did it.

Ok, they came in quietly and shut down the master breaker. The question is how did they know to time it exactly when the boys got in the mysterious room? What was the reason for the sudden strong wind? And what was the cause of the loud sound in the backyard?