Unlock Haku, Rin, Len & Luka.
Alright, Trust me, I get these 4 and they were a slight pain to unlock, So here's how you get them.
Haku Yowane:
Complete Electric Angel with a Standard rank on the Normal difficulty and achieve a max combo of 120 or more on that song.
Rin Kagamine:
Complete Arano to Mori to Mahou no Uta (Rin ver.) with a Standard rank on the Normal difficulty and achieve a max combo of 100 or more on that song.
Len Kagamine:
Complete Arano to Mori to Mahou no Uta (Len ver.) with a Standard rank on the Normal difficulty and achieve a max combo of 100 or more on that song.
Luka Megurine:
Complete Ievan Polkka with a Standard rank on the Normal difficulty and achieve a max combo of 100 or more on that song.
We have more cheats and tips for this game here, Hatsune Miku: Project Diva cheats
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