The endings of the small side buttons are similar to the (W) and (E) forms on the box.
There are two symbols which will give you a key to open the lock.
(W) and (E) are representing West and East.
The two keys from the upper part of the box serving as the keys for this lock.
Pull the upper pin Push the W(est) pin to the left (west) Push the E(est) pin to the left (east) Pull the key Follow the same logic on another side and pull the second key.
Return the four walls from the lower part of the box to the initial state (close the window) to open the key holes.
Pull the upper part of the box – the box is split into two parts
Insert the keys and remove the cover of the secret space.
There is another skull symbol on the box.
Look closely to the card from both sides – they are connected.
Find the inscription “START” on one of the box’s walls.
Follow the arrow sign I -> II