Why Can't I Roll Higher than 3?
Social Point have limited the rolls to 1 to 3, the dice animations are misleading.
? Dragon Pieces
Like in Fog Island style quests, some of the dragon pieces are set the same for all players, and others are different for each player. The ones that display a "?" are those that will be different for each player. You can deduce what piece is what dragon in many cases by checking the distances to next piece as you move through the tower.
Tower Islands require you to pay event points each time you roll. The cost of the rolls increases as you go up the tower. To obtain event points you take actions like collecting gold from habitats, feeding your dragons, and hatching eggs.
The most important thing to know is that there is a timer, and you can only collect 600 during any given 8h time-frame. Once you've collected the max points in that time-frame, you won't get any more until you are in the next 8h hour time-frame.
So pay attention to the timing and don't waste your food, eggs, or time when there's no chance of gaining points from the action!