Penumbra: Overture - Text Walkthrough

[DaniH]

You enter a room with a box full of stones. Enter the room on the right and pick up painkillers and the batteries from the wardrobe. There is also the first artifact, which you can use to save the game. Go back to the room with the box, take out all stones and move the box to uncover a trapdoor. Go down.

It's me (again)... well, i found the storage room and picked up painkillers and batteries and removed the stones and found the trapdoor. But how do I open the trapdoor?? Please help me, even if I sound stupid...

Thank you