Oh and if you get to the last puzzle : Even though some events may seem simultaneous, they are actually resolved from top to bottom, left to right. This is especially important for the final puzzle.
thanks, that was exactly the info I was looking for !
edit: I solved it without using this feature, maybe there are multiple ways, <spoil in rot13>: V chg gur 2 jnaq ba gbc 2 ebjf
