Inside of the coal mine. Turn left, go straight, and reach a dead end. Make a hole in the wall with a drill and peep through it. You will find the secret number!

Use a drill to make a hole

Look inside through the hole and you’ll see the secret number

There is nothing in the room with the yellow sign

Survival Island 2

"Survival Island 2" is a free escape RPG game that anyone can enjoy playing.　Your goal is to escape from the desert island by solving problems.