Capturing Boos are introduced as early as Gloomy Manor's "Visual Tricks" mission. However, the game does not explicitly tell you what is the reward for capturing them all.
| Mission | How to unlock
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|---|
| Gradual Infiltration | Capture all 5 Boos in "Gloomy Manor".
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| Hostile Intrusion | Capture all 5 Boos in "Haunted Towers".
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| Outlandish Interruption | Capture all 5 Boos in "Old Clockworks".
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| Severe Infestation | Capture all 3 Boos in "Secret Mine".
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| Terrifying Invasion | Capture all 5 Boos in "Treacherous Mansion".
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