Les boutons de gauche rendent "activables" certaines cases selon différentes formes (tu vois un cercle orange sur les cases activables). Les boutons d'en haut et de droite te permettent d'activer les cases qui sont "activables" comme indiqué précédemment mais cela active toute la ligne ou toute la colonne. Ensuite il faut que tu t'arranges pour n'activer que les cases en rouge sur ton schéma.

The buttons on the left make certain boxes “activatable” in different shapes (you see an orange circle on the activatable boxes). The top and right buttons allow you to activate the boxes which are "activatable" as indicated previously but this activates the entire row or the entire column. Then you need to manage to only activate the red boxes on your diagram.

So for Security Expert how did you get it? I have seen a few videos that take no time at all and pull the code in and it feels like theyare doing it off the walkthrough online that explains other just gives you the answer.