Imagine you were in a team for exploring an endangered forest. When all the other members go out of your team camp house to a nearby river you chose to stay, which you wouldn't know how regrettable idea that is. After few hours of their absense you came out of the house in search of some pretty animals you end up seeing dangerous animals instead. You anyhow escaped from them temporarily and ran near to your house but your key was missing. Find the key before some wild creatures find you.
