Tag Archives: DIY puzzling

The Riddle of the Two Guards

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Hey there, fellow puzzler. Stop me if you’ve heard this one before:

Ah yes, the riddle of the two guards. Also known as the two doors puzzle, the two guards/two doors puzzle, and, my personal favorite, that awful crap riddle.

It’s easily the most famous example of a Knights and Knaves logic puzzle, which all work off the idea of individuals who always lie or always tell the truth, and a solver who needs to deduce how to proceed.

I think the best and most colorful presentation of the riddle was in the film Labyrinth, thanks to Jennifer Connolly and some very lovely puppetry:

I’ve always wondered about this riddle. Is there a sign posted that explains the rules? Because otherwise, you’d assume the guard who tells the truth would have to explain the rules…

Unless the one who lies tells you the rules, which are a lie, and it’s a trap and you’re totally screwed!

Geez, this is getting complicated already.

Oh good, I’m not the only one who agonizes over this sort of thing. Image courtesy of Crabgrass Comic.

Let’s assume the rules are fair. There’s a guard who always lies and a guard who always tells the truth, and you need a single question to root out which door is the safe one to enter.

The traditional answer is to ask one guard which door the OTHER guard would say leads out.

But what if one of the guards is INVISIBLE?!

If the guard you asked is the one who lies, then he will lead you astray by telling you (falsely) that the other guard—the truthful guard—will point you towards door B. This makes door A the safe bet.

If the guard you ask is the one who tells the truth, he will tell you (honestly) that the other guard—the lying guard—will point you towards door B. This makes door A the safe bet.

In both cases, the outcome is the same: walk through the opposite door.

Naturally, people have tried to find ways around this.

Some suggest that you ask the guards to walk through their respective doors and report back what they see. I don’t know that this would work, because it’s not clear if the guards would have to follow your orders. Also, we don’t know if certain doom for US would be certain doom for the guards. If they both walk out totally fine, it probably won’t work.

For another option, you can act in typical Dungeons and Dragons-fueled fashion and use what I call the direct approach:

But unfortunately, it misses the meat of the riddle. It’s not just knowing which guard lies and which guard tells the truth, it’s about knowing which door to take as well.

Of course, if you believe the folks at XKCD, there are consequences for cleverness as well:

Although it is a riddle easily given to weasel words and pedantry, it has led to some wonderful comedy.

This joke, for instance, gives us some much-needed backstory to the guards and their current circumstances:

In a similar vein, this one lets us see one guard’s life after clocking out for the day:

I also enjoy this one, which ponders what sort of person would employ a riddle like this as a security measure in the first place:

So I put it to you, fellow puzzler: how would you tackle the riddle of the two guards? Labyrinth style? Barbarian style? Or have you conjured up a different question to ask the guards?

Let us know in the comment section below. We’d love to hear from you!

Twin Films Film Festival Test!

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Are you familiar with the concept of twin films, fellow puzzlers?

The basic idea involves the commercial release of two films with extremely similar plots or concepts being released in proximity to each other.

For example, if I described a 1998 global disaster film centered around an impending impact event that threatens to end most or all life on Earth, what film would you name?

You could answer Deep Impact or Armageddon and be correct either way. These are quintessential twin films.

Wait, no, not this kind of Twins film…

So if I give you the year of release and a description, can you name the twin films that fit the clue?

Let’s find out, shall we?

Twin Films Film Festival Test!

  1. 1997: disaster films centered around volcanic eruptions
  2. 2012: loose adaptations of the fairy tale Snow White
  3. 2024: fourth installments of action-comedy franchises centered around African-American cops
  4. 2004: romantic comedy films about the rebellious daughter of the President of the United States
  5. 1999: supernatural horror films with a man and his relatives, experiencing a series of frightening visions and having the ability to interact with ghosts.
  6. 2017: films prominently feature the planning of the evacuation of Dunkirk.
  7. 1998: computer-animated films about insects, starring a non-conformist ant who falls in love with an ant princess, leaves the mound, eventually returns, and is hailed as a hero
  8. 2018/2019: computer-animated films about abominable snowmen making first contact with humans, both set in the Himalayas.
  9. 2006: films about 19th-century magicians
  10. 2022/2023: adolescent girls who transform into larger creatures under certain conditions.
  11. 1994/1995: films with drag queens going on a road trip across their country (in one case Australia, in the other, the United States) in a journey of self-discovery. Both have eight-word titles.
  12. 2023: films based on Dracula released by Universal Pictures
  13. 1999: caper films focused on the relationship between an attractive female insurance investigator and a male thief who steals an expensive painting by a famous artist. (Coincidentally, the male lead in both films is also played by an actor who has portrayed James Bond.)
  14. 2010: films featuring a stereotypical villain as the protagonist
  15. 1996: alien invasion films where the earth is rapidly and suddenly overwhelmed, only to be defeated by a ragtag group with borrowed technology
  16. 2005/2006: computer-animated films involving similar animal characters from New York’s Central Park Zoo being introduced to the wild.

How many did you get? Let us know in the comments section below, we’d love to hear from you!

Free RPG Day Is Only a Few Weeks Away!

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Whether you’re a veteran of many roleplaying campaigns, someone who has dabbled in a few dice-rolling sessions, or a total newcomer to the RPG hobby, one of the best days of the year is fast approaching.

Saturday, June 21st is Free RPG Day!

The concept behind Free RPG Day is simple. All over the world (but mostly in the United States), local game shops, hobby shops, and other outlets team up with RPG publishers to distribute new, fresh, and most importantly, free material for all sorts of different roleplaying games, systems, and settings.

Sometimes they’re quickstart versions of the games to introduce new players. Sometimes they’re exclusive adventures or modules to play either in-store or at home. Othertimes, they’re entirely new games, free of charge.

Not only can you receive a wealth of new ideas and playing options in one fell swoop, but it serves as a terrific way to meet fellow roleplayers and build a community of game enthusiasts.

You can click this helpful link to find local spots near you that are participating in Free RPG Day, and I would highly recommend searching online for local game shops, game cafes, and even community centers like your local public library to see who is participating.

These shops will often be running demonstrations of games, tutorials on how to play, hosting raffles and contests, and offering terrific sale prices to encourage you to find the game that fits you best.

Every year, dozens of companies get involved, not only to encourage the growth of the game world, but to promote their own products. And what better way is there to get people hooked than with free exclusive materials begging to be tried out?

Keep your eyes peeled for this year’s edition of the Level 1 Anthology, offered by 9th Level Games. It’s a collection of new games by up-and-coming and established RPG creators, all centered around a particular theme. Last year’s edition was all about programming. This year’s is about the end of the Wild West.

This project is close to my heart because I had a game featured in last year’s Level 1 collection, and I also have a game featured in this year’s collection!

You can check out ANY of the previous years’ Level 1 Anthologies free of charge on the 9th Level Games website!

Are you planning on participating in this year’s Free RPG Day events? Let us know in the comments below! We’d love to hear from you.

No Prep Road Trip Games!

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Summer is nearly upon us, and with the arrival of summer, one cannot help but think of road trips with friends and ways to pass the time in the car.

While singalongs, I Spy, and the License Plate Game are all well and good, perhaps you would like a little more challenge with your road trip games.

Well, you’ve come to the right place. Here’s a few suggestions for road trip games that require no preparation, save for a little imagination!

The Movie Game

I learned this game while stuck on a long train ride, and it certainly made the delays go faster.

Someone starts with a film, and the next player names an actor in that film. The next person names ANOTHER film that actor has appeared in, and the next person names ANOTHER actor from that film. And you keep going until someone can’t continue the game.

(If you present an actor or film in the chain that the next player can’t continue, you can only eliminate them by offering another answer, showing that the chain can continue. If you give them a chain link you can’t continue either, you’re out!)

It’s surprisingly difficult, because the more you play, the more devious you try to get. You want to lure other players down garden paths, but you have to make sure you don’t go so obscure that you can’t find your way out as well.

Playlist

Friend of the blog Jen Cunningham created a music-themed version of The Movie Game: Playlist.

In this version, you start with a song and an artist, and the next player either names another song by that artist OR another song using one of the key words in the song.

So, for instance, if you say “Sgt. Pepper’s Lonely Hearts Club Band” by the Beatles and you need to match the song, you could do “Owner of the Lonely Heart” by Yes or “Only the Lonely” by Roy Orbison. Then someone needs to name another Yes song or another Roy Orbison song, and then the chain continues.

I find this game slightly more challenging than The Movie Game because of both the musical knowledge (which isn’t as strong as my movie knowledge) and the associative nature of the song title aspect. But many hours have been wiled away with this game!

My Friend Is An Expert… / Conspiracy Theory

In this game, the first player picks two random subjects, and then prompts the next player with them, and it’s the next player’s job to explain in entertaining fashion something fascinating about them that only an expert would know.

For instance, the first player would go “My friend is an expert in ancient archaeology and polka music” and the next player has to riff on those subjects for a bit. Other players can ask questions to continue the silliness.

The game continues with different topics and additional nonsense.

There’s a similar game to this called Conspiracy Theory where someone has to rant about the grand conspiracy behind two seemingly unrelated topics provided by the other players.

Both of these are great fun with a group of improvisers or snake oil salesman during a long road trip.

Alien Ambassador

(I haven’t played this one yet, but a friend recommended it, so I’m happily including it.)

In this game, one player is selected to be the alien ambassador, an alien visiting Earth for the very first time. The other players must answer the alien’s questions and explaining simple concepts to them. (It’s sorta like that comic strip with the aliens.)

As the alien ambassador asks more questions about this, the players will invariably scramble to explain the very weird things we accept as normal, everyday life, and laughter will ensue.

Hastur Horta Hodor Mordor

Inspired by a Dork Tower comic, Hastur Horta Hodor Mordor is a road trip game that actually became a real card game. But let’s focus on the road trip version.

This is a memory game where one player says a word — preferably one related to fandom, geek culture, etc. — in order to begin a nerdy tongue twister. The next player says that word AND another word. The next player says the two previous words AND another word, and the chain continues.

If you can’t complete the chain or you hesitate too long, you get a Hodor point, and a new chain begins.

If you get 3 Hodor points, you can only say “Hodor” for the rest of the car ride. (That’s a reference for the Game of Thrones fans in the audience, if there are any of you left after those dismal final seasons.)

Do you have any favorite no prep road trip games, fellow puzzlers? Let us know in the comments section below! We’d love to hear from you.

Antonym TV Shows!

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In today’s post, I’ve got a silly little puzzly challenge for you. I’m going to give you the antonym of a television show’s title, and you need to give me the show.

For example, “Not at All Justified” would mean “Justified” or “Lawlessness and Chaos” would be “Law and Order.”

And yes, they do get wackier, more specious, and more elaborate as we go.

So, without further ado, let’s play!

ANTONYM TV SHOWS

  1. Enemies
  2. Found
  3. The Idle Alive
  4. Less Peculiar Nothings
  5. Misery
  6. Before Twelve
  7. Southern Obscurity
  8. Me
  9. Saving Adam
  10. White Non-Reflective Surface
  11. The First of Them
  12. Ugly Large Honest People
  13. Heaven’s Dining Room
  14. The Small Pop Certainty
  15. Very Vulnerable
  16. The Basses
  17. Unfettered Lack of Progress
  18. Water Walk
  19. Near Stay
  20. Many Whole
  21. Unseriousness Rises
  22. Truth Angel
  23. Attachment
  24. Drives and Work
  25. Minor Childless Man
  26. Keep a Potato in Pristine Condition
  27. Bullgirl Classical
  28. Legal Disobeys
  29. Uncertain Key
  30. Jeers

How many did you get, fellow solver? And how many did you groan at when you figured them out? Let me know in the comment section below!

New Rubik’s Speed-Solving Record: Blink and You’ll Miss It!

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Clever, quick-fingered solvers are constantly pushing the boundaries of what can be accomplished with a Rubik’s Cube.

I’ve seen the world’s most complex Rubik’s-style cube being solved, a building turned into a solvable Rubik’s Cube, and a Rubik’s Cube solved one move at a time by strangers across the globe.

I’ve even seen a Rubik’s Cube solved during a skydive.

But, amidst all those amazing achievements, there has been something lurking in the background. Over the years, there has been an escalating cold war in the world of Rubik’s Cubes.

The two sides? Human and machine.

The battlefield? Speed-solving.

Human speed-solvers often count their records in seconds, not minutes. The current record for a 3×3 cube solve is 3.05 seconds!

But speed-solving devices are often so fast that they end up ripping the cube to pieces instead of completing the solve. So puzzly designers must carefully walk a tightrope between speed and power in order to challenge speed records for mechanical solvers.

The record for an automated solve is an astonishing 0.305 seconds – ten times faster than the fastest human solve! — set by Mitsubishi Electric engineers in Japan in May 2024.

Or it was, until a few days ago.

The new Guinness World Record for “Fastest robot to solve a puzzle cube” belongs to Purdubik’s Cube, the robot created by Junpei Ota, Aden Hurd, Matthew Patrohay, and Alex Berta, a team of students from Purdue University’s Elmore Family School of Electrical and Computer Engineering.

The new record? 0.103 seconds.

It’s hard to fathom how quick that is. Thankfully, one of Purdubik’s Cube’s creators has an apt analogy:

“We solve in 103 milliseconds,” Patrohay said. “A human blink takes about 200 to 300 milliseconds. So, before you even realize it’s moving, we’ve solved it.”

Utilizing a combination of color recognition and finely-tuned industrial-grade motion-control hardware — guided by algorithms written by the students themselves — Purdubik’s Cube carefully accelerates and decelerates its movements faster than the eye can see.

And despite the fact that a team of four college students smashed a record previously held by a billion-dollar corporation, they’re not done yet.

They aspire to solve a Rubik’s Cube with Purdubik’s Cube in less than a tenth of a second! I don’t know how they expect to shave a few milliseconds off their time to achieve their goal, but you know what? I fully believe they can do it. In less than a year, they set their goal of a new Guinness World Record and achieved it.

Who knows what they’ll achieve next?

[You can read the full story of their journey from the initial goal to their world record success on the Purdue Engineering website. I highly recommend it!]