WHAT IS INVISIBLE AND MAKES PEOPLE SUFFER FROM SYMPTOMS LIKE SWEA , RIDDLES WITH ANSWERS TO SOLVE - PUZZLES & BRAIN TEASERS

Vanishing Cream Did you answer this riddle correctly?
YES  NO  

2 people remain. Dont forget to count the murderer. Did you answer this riddle correctly?
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He asks you to be his Ghoulfriend. Did you answer this riddle correctly?
YES  NO  

A stamp. Did you answer this riddle correctly?
YES  NO  

If the backyard and garden are two different locations then there would be one person left in the garden. This is because the murderous rampage took place in the backyard, not the garden. However, the riddle solver considers that the backyard and the garden is the same place then, then zero people would be left, as the killer would technically be counted amongst the 34 people. Did you answer this riddle correctly?
YES  NO  

5

You walked into the room which added 1 + 34 = 35

Then you take away 30 from 35 = 5 Did you answer this riddle correctly?
YES  NO  

A mirror Did you answer this riddle correctly?
YES  NO  

A coffin Did you answer this riddle correctly?
YES  NO  

A knight Did you answer this riddle correctly?
YES  NO  

Your voice. Did you answer this riddle correctly?
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When he's a ruler Did you answer this riddle correctly?
YES  NO  

Barty Crouch Jr Did you answer this riddle correctly?
YES  NO  

Phil Brooks, the disposable needle Did you answer this riddle correctly?
YES  NO  

The elevator. Invented by Alexander Miles Did you answer this riddle correctly?
YES  NO  

At least 23 people. Did you answer this riddle correctly?
YES  NO