Advanced mode includes the boolean
intersect operations. The example below shows how you can make a dice from a block and a sphere. The sphere is slightly bigger than the block and moved up a bit so that is partly sticks out the cube. The middle object shows what happens if you subtract the sphere from the block. The object in the front shows the result of the
intersect operation: a cube with rounded corners, which looks like a dice. As you can see, Boolean operations are a very powerful tool to make complex objects from simple shapes.