- The Extra difficulty chart is unlocked after watching the Where It Goes Memory in playthrough 4 (requires Forgotten Hourglass).
- The Extra difficulty chart is the only chart in the game to require 4 fingers to play (2 Tap + 2 Slide). It also contains a unique 3-finger combination (2 Tap + 1 Slide).
- Aragami and La Campenella are the only songs to have a Level 7 Easy difficulty.
- No one has achieved All Charming on the Extra difficulty yet, but a few people have gotten a Full Combo.
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