Next to the additional treasure in the bottomless pit level is a hole you can crawl through. The key for the ruins door is in there. In the ruins level, theres a statue pointing up. Jump there.
I still can't find the key for the locked door on surface level - could you please clarify? What is the additional treasure? And exactly where is it? Please help!
He is speaking about the sun artifact you find in level 15. Next to it there is a hidden crawl space leading to a secret area. Exploring it will get you a golden key. That can be used to unlock the gate in level 14.
