Once again, this very uninteresting puzzle mechanic. I totally relay on in-game user board for this one.

☆☆☆ Underground 51F ☆☆☆

You might not get enough score to get all the rewards, so use someone who can use DoT on 4 and 5 on this floor.

1. Supporter
2. Mia (Charm 3)
3. Supporter
4. Warrior (Kill 7)
5. Warrior (Kill 8)
6. Meat Shield

☆☆☆ Underground 52F ☆☆☆

1. Supporter
2. Mia (Charm 3)
3. Supporter
4. Defender
5. Warrior (Kill 8)
6. Marron (Kill 14, 6, 10)
7. Sizka (Kill 3)

☆☆☆ Underground 53F ☆☆☆

1. Marron (Kill 1)
2. Warrior (Kill 11)
3. Sizka (Kill 7,9)
4. Magician
5. Mia (Charm 10)

☆☆☆ Underground 54F ☆☆☆

1. Magician
2. Mia (Charm 3)
3. Marron
4. Warrior
5. Sizka

☆☆☆ Underground 55F ☆☆☆

Lydia has to be +9 to get 3 tile attack. On 2nd round, Sizka will finish the game.

1. Cordelia (Kill 9, 13)
2. Lydia+9 (Kill 10, 12)
3. Marron (Kill 3, 14)
4. Thalos (Kill 4, 11)
5. Sizka (Kill 2, 5, 6, 7, 8)
6. Mia (Charm 1)
7. Meat Shield