Unlock the following levels by collecting the corresponding numbers of Lucky Dolls and then talking to the Lucky Doll NPC:
LEVEL - LUCKY DOLLS Baal Tower - 70 Lucky Dolls. This level is accessed by the Dimension Guide. Etna Boss Battle - 100 Lucky Dolls. This level is accessible from Etna's chamber Overlord Priere Stage - 36 Lucky Dolls. This level is accessed by the Dimension Guide.