I cant get past tunnel level 3

I used to really enjoy this game and I actually defeated it. However, after I defeated it, I tried to start a new game, but when I got to the tunnels that led to the underground drill that powered Dahags arkstone, I couldnt get past tunnel level 3. There was only a stair case leading back up to tunnel level 2. I tried deleting the app and downloading it again to see if it would stop this, but I still have the same problem. Could you please fix this? I really like this game and would like to play it again. Thank you!

Eponine-chan about Hunter Island: Monsters & Dragons