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Death Note is a manga/anime series in North America. View Wikipedia article. This world will only become unlocked once you pay 400 purple gems on Ou Tenkun's evolution chart.
- Defeat all opponents. Doing this will unlock Light/Ryuk.
- Knock out an opponent by ring out.
- Knock out two opponents by ring out.
- Knock out three opponents by ring out
- Win within 50 seconds. Doing this will unlock Near.
- Defeat all opponents. Doing this will unlock L.
- Win within 40 seconds.
- Win within 30 seconds..
- Win within 20 seconds.
- Don't get hit by a special Doing this will unlock Mello.