Spot the Alien: Costume Party

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Two of the eight people at the costume party are aliens. Can you find them?

Clues:

  1. Nobody who entered the dance contest and is wearing a mask is drinking any punch.
  2. Every masked superhero, and everyone who is neither wearing a mask nor dressed as a superhero, entered the dance contest.
  3. Everyone wearing a mask but not dressed as a superhero, and everyone dressed as a superhero but not wearing a mask, is human.
  4. No aliens who entered the dance contest are drinking any punch.
  5. Every alien dressed as a superhero is drinking some punch.

People:

  • Amy, who is wearing a mask and drinking punch
  • Bert, who is wearing a mask and not drinking punch
  • Charlene, who is drinking punch and not wearing a mask
  • Dimitri, who is neither drinking punch nor wearing a mask
  • Evelyn, who is dressed as a superhero and entered the dance contest
  • Frank, who is dressed as a superhero and did not enter the dance contest
  • Gladys, who entered the dance contest and is not dressed as a superhero
  • Harold, who neither entered the dance contest nor dressed as a superhero

Who are the aliens?

Scroll down for the answer!

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer:

This puzzle can best be solved through process of elimination. Let’s look at each person, one by one.

Amy is wearing a mask and drinking punch. From clue 1, we know she did not enter the dance contest. From clue 2, we know she is not dressed as a superhero. Therefore, from clue 3 we know she is human.

Bert is wearing a mask and not drinking punch. Either he’s dressed as a superhero or he isn’t. If he is, then by clue 5 he can’t be an alien. If he isn’t dressed as a superhero, then by clue 3 he must be human. In either case, Bert is human.

Charlene is drinking punch and not wearing a mask. Either she’s dressed as a superhero or she isn’t. If she is, then by clue 3 she must be human. If she isn’t dressed as a superhero, then by clue 2 she entered the dance contest. By clue 4, she can’t be an alien. In either case, Charlene is human.

Dimitri is neither drinking punch nor wearing a mask. Either he’s dressed as a superhero or he isn’t. If he is, then by clue 5, he’s human. If he isn’t dressed as a superhero, then by clue 2 he entered the dance contest – and we can’t tell if he’s human or alien. At this point, we don’t have enough information to decide.

Evelyn is dressed as a superhero and entered the dance contest. Either she’s drinking punch or she isn’t. If she is, then by clue 4 she can’t be an alien. If she isn’t drinking punch, then by clue 5 she can’t be an alien. In either case, Evelyn is human.

Frank is dressed as a superhero and did not enter the dance contest. By clue 2, he must not be wearing a mask. Therefore, by clue 3, he must be human

Gladys entered the dance contest and is not dressed as a superhero. Either she’s drinking punch or she isn’t. If she is, then by clue 4 she can’t be an alien. If she isn’t drinking punch, then we can’t tell if she’s alien or human. Once again, we don’t have enough information to decide.

Harold neither entered the dance contest nor dressed as a superhero. By clue 2, he must be wearing a mask. By clue 3, he must be human.

We’ve eliminated six of the attendees as human; therefore, the two aliens must be Dimitri and Gladys.

About Author

The puzzlemonster. Lifelong puzzle maker, animal lover, total nerd. Husband to Android developer.