Go find Dante
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While exploring on B8, look through the peeping hole to see Tristan (can be viewed twice)
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Go back to Dante
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Go to the peeping hole again with Dante
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Go to the button and press it
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Talk to the old man
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Talk to the old man again
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Collect 10 mosquito oils
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Return to the old man to receive the bomb
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Go back to the button
→ Defeat the Queen