# At least there’s no giant boulder chasing you…

[Is this the way out or a costly dead end?]

We’ve tackled all sorts of brain teasers in the past. From the Brooklyn Nine-Nine desert island seesaw to several hat puzzles, from Cheryl’s birthday logic puzzle to a diabolical light switch puzzle, we have conquered all challengers thus far!

But never before have we confronted a puzzle with as much backstory as today’s contender. Ladies and gentlemen and PuzzleNationers of all sorts, today we battle the Temple Tunnel puzzle.

Imagine that you’re a professor leading a group of eight grad students on an expedition into a booby-trap-filled temple.

[No, not THAT professor.]

After two of the students bump into an altar, they activate a trap, sending everyone scrambling for the exits before the temple collapses all around you.

The group finds itself in a room with five tunnels and an hourglass detailing how much time you have to escape. One of them leads back to the altar and the other four are possible routes of escape. Unfortunately, you can’t remember which one it is!

All you remember is that it took approximately twenty minutes to get here from the exit. How do you determine which tunnel is the correct one, and get everyone to safety?

Oh wait, there’s one more little complication. That altar the students bumped into? It released the vengeful spirits of the temple’s king and queen, which have possessed two of your students. So you can’t trust what they say.

So how do you figure out which tunnel is the right one without being deceived by your two compromised students?

[Image courtesy of XKCD.com.]

*deep breath* Wow, that’s quite a setup! So let’s summarize:

• You have an hour to escape, and four corridors to explore.
• Each corridor will require 40 minutes to explore: 20 minutes to determine if it’s the exit, and 20 minutes back to report your findings.
• Whatever groupings you break the team up into, you have two possible liars among them, and no way to determine which ones are the liars before sending them down a tunnel.

For a wonderful animated version of this puzzle, as well as its solution, check out the YouTube video below from TED-Ed:

Now, while the solution itself is quite clever, I can’t help but ask certain questions:

It says that the possessed students can’t harm the others, but can they mislead them with actions as well as words?

I’ve seen several proposed solutions that included not only sending groups down the tunnels, but instructing one or more of them to leave the temple immediately if they find the exit (meaning that not seeing them return would confirm they’d found the exit). But if the liars can simply stay at the dead end, that would be a false confirmation of finding the exit.

The video is ambiguous about this, because it says the spirits will lead them to their doom, but then it also says that the curse only affects their communication.

How does the group know you’re not one of the liars?

The solution is entirely dependent upon you being able to explore a tunnel alone, because that determines the groupings for the other three tunnels. If you have to take someone with you (either an honest student or a liar), that affects your ability to draw proper conclusions from the other groupings. And even if you find the exit, the student with you could lie about it, and there’s no way to prove the truth to the group definitively.

Why not just ask each student individually a question the ancient king or queen wouldn’t know the answer to?

Presumably the spirits of ancient royalty wouldn’t know about the latest episode of NCIS or which version of Windows we’re up to.

In any case, this was a delightful mind-bender, one that has stumped many an intrepid solver. How did you do? Tell us in the comments below!

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# DIY Pencil and Paper Puzzles!

Picture this. You’re stuck somewhere with friends. The airport, a traffic jam, wherever. Nowhere to charge your phone, so you can’t play Trivia Crack or solve any of the great puzzles offered by the Penny/Dell Crosswords app.

All you’ve got is paper and pencils, and you’re in a puzzly mood. What do you do?

Well, you whip up some DIY puzzle fun, of course.

Now, the classic go-to pencil and paper game is Hangman. The goal is simple: guess the complete word or phrase by guessing one letter at a time. Each correct letter is filled in every time it appears (like on Wheel of Fortune), and each incorrect letter results in one piece of the Hangman being drawn. If you let too many incorrect guesses stack up before solving the puzzle, the Hangman is completed and you lose.

People have differing rules when it comes to the Hangman’s complexity. Some draw the gallows and noose as well as the Hangman, while others pre-draw the gallows and noose, only drawing the Hangman when wrong guesses occur. (I, for one, always liked drawing him a jaunty top hat before sending him to his demise.)

I can remember a time we played Hangman in high school because the professor for our physics class didn’t show up. One of the other students I didn’t know very well suggested it, and his first two puzzles were cracked pretty quickly. But then the third one had most of the class stumped.

It read: C A P T A I N ___ O ___

People kept guessing “Captain Ron,” even though there was clearly no N in that second blank. When I realized it was “Captain Lou,” I blurted out the answer, and suddenly, we were fast friends.

Because of Hangman.

Another simple game is Guess My Word. One person chooses a word, and the other narrows it down by guessing words and being told if those guesses precede or follow the secret word in the alphabet.

For instance, if the word was QUINTET and your first guess was HALLOWEEN, I would say after. So, in one guess, you’ve eliminated every word that comes before HALLOWEEN alphabetically.

And if you’d like to give it a shot, puzzle constructor Joon Pahk created a Guess My Word feature on his website that is great fun (and sometimes pretty challenging).

I was going to mention Tic-Tac-Toe here — another staple of the pencil-and-paper puzzle game genre — until my mother mentioned a variation she read about in Parade magazine.

In the article, Marilyn vos Savant is credited with creating Toe-Tac-Tic, a reverse Tic-Tac-Toe game wherein getting three in a row means you lose.

It’s a completely different style of game play, adding a nice twist to a classic game. (Though, quite honestly, I’m not sure we can credit vos Savant with its creation, since I can remember seeing this played in the mid-2000s. I’m not sure anyone called it “Toe-Tac-Tic,” but the rules were the same.)

And finally, for fans of card games, you can always whip up a round of 1000 Blank White Cards.

Named for the only thing you need to play — a bunch of identical blank pieces of paper, index cards, or something similar — 1000 Blank White Cards is a game you design and play both before and during the game! You can also further refine the game in subsequent sessions.

As Wikipedia so aptly puts it:

A deck of cards consists of any number of cards, generally of a uniform size and of rigid enough paper stock that they may be reused. Some may bear artwork, writing or other game-relevant content created during past games, with a reasonable stock of cards that are blank at the start of gameplay.

Some time may be taken to create cards before gameplay commences, although card creation may be more dynamic if no advance preparation is made, and it is suggested that the game be simply sprung upon a group of players, who may or may not have any idea what they are being caught up in. If the game has been played before, all past cards can be used in gameplay unless the game specifies otherwise, but perhaps not until the game has allowed them into play.

Once your initial deck of cards is created, players draw a card from the deck and either play them, keep them, or add them to the active rules of the table so they affect everyone. In this way, gameplay is quite similar to another classic puzzle card game, Fluxx, especially with the ever-changing rules and malleable gameplay.

Not only has 1000 Blank White Cards appeared in GAMES Magazine, but it was also included in the 2001 revision of Hoyle’s Rules of Games.

I am a huge fan of customizable games, so I have played 1000 Blank White Cards many times. From cards that can cause immediate victory to cards that can negate those cards, from point cards and rule cards to cards that requiring singing or truth-or-dare challenges, the possibilities are endless.

Some of my favorite cards are just drawings of turtles, where another card grants you special powers or bonuses depending on how many turtle cards you have. Another allows you to create a new card on your turn, either to keep for yourself or to give to another player.

And the rules can depend entirely on who you’re playing with. Sometimes, you can make a new card every round, while other times, you can only introduce a new card when you’ve drawn a card that allows it. Heck, there might even be blank cards in the deck that you can draw and customize immediately! It is literally up to you and your fellow players how to play.

Fans of Calvin and Hobbes will no doubt draw comparisons between 1000 Blank White Cards and Calvinball, and rightfully so. (Savvy card-game players may also recognize similarities to the figure-out-the-rules-while-you-play game Mao.)

But whether you’re playing Hangman or guessing a word, getting three in a row or avoiding it at all costs, or even creating your own signature game, as long as you’ve got a partner in crime and an imagination, you’re never without a puzzle.

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