Forest Lake Escape

A group of energetic guy is taking part on a two weeks long camp which is situated next to a lake. They spot a house at the opposite side of the lake immediately as they arrive. Sneaking out of the camp in spite of the curfew they approach the building at night. They can't bear not to peek inside. As they get in, the breeze shut the door behind them. They can't open it despite all their efforts. Gather the hidden objects and fit them together to lend a hand to them.