On the Second floor, Noah, who was sitting cross-legged on the ground suddenly opened his eyes and looked at the back of his left hand.
He could feel a sensation similar to anta crawling at the back of his hand as he saw a black dot kind of mark appearing at the place. The mark was not that large but it was visible if someone paid attention to it.
The dot had a pointed edge in the straight-up direction. Noah checked the mark with his soul sense and he surprisingly found that this mark had something in common with the key he found on the first floor.
'I don't need to think about it until I reach the last floor.'
He then turned his face to look at the timer in the air and was surprised at the time it took him to comprehend the technique.
[23:49:58]
It took him less than 7-8 minutes to get a basic understanding of the very first technique he learned after he chose and memorized the details on the walls.