OK so I will post some hints then a pic of the solution after that so spoiler alert. The panel is made of a 6x6 square, wich gives you 36 squares. When you are searching you will find clues to help you determine what to do for the panel of squares. You get your fisrt clue in the locker where you start (wich I still dont totally get except for the area that has the 3 in it. *hint* *hint*). Second clue is on the wall once you get through the first door (green x 27.5). The third clue is in the cabinet that you use the axe to break into (black x 8.5). If you noticed the last two numbers add up to 36, the amount of squares on the panel. On the panel there are three areas in green with the number 4, two with the number 5, one with the number 6, and one with the number 3. Those tell you how many sides are to the shape they are supposed to make. So the task is to make shapes that have the number of corresponding sides the number in green tells you. The panel must have 27.5 squares (thats the total amount the green parts would add up to) that are green on it and 8.5 black (same with black). Good luck, hope that helps. OH and to finish the game you press on the wall or the panel, and the wall opens up
Spoiler alert: If you dont want to see the finish puzzle please skip this part. For those of you that do, here is the finished puzzle (it was a rough rough sketch I drew of it, sorry for that.)