One of the riddle in that area is stones above certain animals. Two gates need to be opened by doing math and pushing a number-stone on the field. The number-stones go from one to six.
The left riddle is, according to the (German version) hint: "Subtract the bunny from the seagull and you get the right number."
There are 3 small and 1 big stone above the seagull and one big stone above the bunny. So, removing the big stone leaves 3 small stones. Yet, the correct number-stone is actually the 5 stone (I just pushed every stone on it until I found the right one)
The right riddle says "Subtract the raven from the snake." Snake as 3 small stones above it, the raven has one big stone and 3 small ones. So, removing the three small stones leaves the big one and the correct number stone was the 1 stone, which in this case makes sense.
So, is the riddle wrong? Shouldn't it say "Add the bunny to the seagull"?
If not, can someone explain how removing one stone from four comes to five?