Most objects in the game are breakable.
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For example, when fighting in a room surrounded with walls, walls can easily get damaged by princess’s sword or monsters attack.
They break, the broken pieces drop and damage everyone in the room.
You also needs to break through the wall to see what’s behind, or to charge the monsters.
Sometimes there are secrets behind the wall.
And of course, there are some path you can pass only when they are good.
You might have to jump from top of a pillar to another to reach the goal, be quick before they broken.