Pic of the day. Here's the Fiend's Scale in Classic mode. When you raise the intensity in the 3DS version, the effects looked similar to a picture book. However, for the Wii U version, as you raise your intensity it looks like you're falling deeper into the underworld. The very bottom looks ferocious.
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The field in Classic mode has five different backgrounds determined by the intensity level. On low intensity, the background looks peaceful, but on high intensity, the atmosphere gets pretty intimidating.