Custom Creations board and Side Levels board are very similiar. But you need to understand the difference well. In Side Levels board, you can find an index of the inventions, discoveries and masterpieces done by a character from a side. The bigger the invention/discovery/masterpiece is the larger the sides will earn. Each time a player from the sides does a discovery, creates and invention/masterpiece, the side earns Experience Points. Each level has 10 boxes. And with these, the sides can earn boxes and level up. Leveling up, will improve the inventions, make faster to make a discovery and make easier to create a masterpiece.