I recently published an analysis on the Master Lock 4 letter combination locks. They have an unusual letter distribution and I was curious how many English words could be generated with those locks. It turned out that those Master Locks could create a lot more words than I had anticipated.
Absolutely everything about this analysis and its outputs conforms to the same information presented in the last letter lock analysis, so I won’t rehash it. It’s on the Master Lock post if you’re interested.
Odd Letter Distribution Hypothesis
After publishing the last analysis some members of the room escape community proposed a hypothesis about the odd letter distribution on those Master Locks:
It seemed like Master Lock may have been trying to make it impossible to spell curse words.
This seems like a valid answer for both Master Lock and WordLock’s letter selection. I cannot prove this one way or another, but you cannot generate the most popular American English swear words with these locks… so that’s probably not a coincidence.
Nevertheless, sifting through the wordlist revealed a few “vulgar” or degrading words… and I’m including them because my inner 10 year-old thinks this list is hilarious:
This hard plastic spring-loaded sheath slips over the mouth and neck of a bottle. It seals shut using strong spring tension and locks shut with a key.
I was shocked at the breath of bottle necks that the Tantalus Wine and Liquor Bottle Lock fit over, both narrow and wide.
Securing a wide-mouthed bottle of whiskey.
Securing a narrow-mouthed bottle of beer.
There are two downsides to this lock:
Aesthetically, it’s unattractive.
Given its plastic construction and the surprisingly strong spring tension, I suspect that it might give out with repeated use. That being said, I’ve opened and closed it a few hundred times and it’s still working like the day I removed it from the package. At $15, it’s also pretty disposable.
This is another hard plastic spring-loaded sheath that slips over the mouth of a bottle… except this one is junk.
Due to its narrow diameter and exceedingly inflexible design, this lock cannot fit around most of the bottles that I attempted to secure.
It couldn’t come close to securing the largest bottle we owned.
This bottle wasn’t massive, but the lock could not close.
It fit over this beer bottle, but it also pulled off with no resistance.
When it does fit, it looks aesthetically pleasing.
It opens with a customizable 3-digit numeric combination. With the correct digits in place, it snaps opens with the push of the silver button on the top of the lock. Its operation is self-explanatory.
It feels so flimsy that I continually worried that I might have broken it while trying to put it onto a few bottles. I didn’t break it, but I wouldn’t bother with it for an escape room because it almost certainly won’t be durable enough, even at $9 per lock.
This metal 4 digit numeric combination lock looks good and feels great. On initial inspection, it seemed like a real winner. Then I saw how it worked:
This lock completely replaces a bottle’s existing top/ cork/ stopper.
With the correct code in place, it inserts into the mouth of a bottle like a cork or stopper. Then you start twisting the top of the lock. In doing so, it slowly expands the stopper until it fills the mouth of the bottle and cannot be removed without unwinding it.
It takes a lot of spinning to expand or contract it. This would be baffling in an escape room.
It also didn’t fit most of the bottle mouths that I attempted to close with it. The bottle mouthes were too wide and the stopper ended up distorting in shape.
Normal, retracted state.
Expanded, closed, and distorted state.
This lock is clunky, weird, and decidedly user-unfriendly. Absolutely skip this thing.
A word on security
Escape rooms aside…
While locks like these could function as a deterrent to thieves lacking motivation, none of them would adequately secure liquor from a motivated thief. All of them are breakable with enough force or some basic tools.
The 3 digit lock only has 1,000 possible combinations; that wouldn’t take all that long to test.
The 4 digit lock has 10,000 possibilities, but it has some pickable weaknesses.
Tantalus Wine and Liquor Bottle Lock is pickable, but due to its heavy spring tension, it was pretty difficult to pick. It is my choice for both escape room gameplay and bottle security.
(If you purchase via our Amazon links, you will help support Room Escape Artist as we will receive a very small percentage of the sale).
Price: $24.75 (prices may vary based on seller and configuration)
Why test this lock?
tl;dr (too long; didn’t read):Escape rooms are a difficult environment for locks, and the Marine Brass 38 was designed for harsh environments.
Padlocks aren’t typically designed to be opened a dozen times a day. They tend to age quickly and seize up from the overuse of an escape room.
The Marine Brass 38 was designed specifically for use on boats and docks, a different harsh environment. Between the moisture and salt, locks don’t usually fare well near water. This is why I decided to grab one to test for escape room usage.
tl;dr:The Marine Brass 38 has a simple, lightly branded, largely timeless look.
The Marine Brass 38 is built from thin interlocking pieces of laminated brass. Its body is dense and solid. Its shackle is a boron steel alloy. The lock has barely any branding on it.
It has a simple, clean, and classic look. Out of the box, it is bright and shiny, but it will quickly darken with handling.
The brass aesthetic makes it easily visible in a room. It doesn’t suffer from the in-your-face branding that makes many of the more common locks feel out of place in historical rooms. It doesn’t look ancient, but it doesn’t look overtly modern either.
The brass keys look like they belong with the lock.
tl;dr:The Marine Brass 38 works smoothly. It is less likely to break than most of your common escape room locks.
The lock’s dead core means that the cylinder holds no spring tension. Similarly, the shackle and locking mechanism have no spring tension. As a result, the key takes nearly no pressure to turn. Once unlocked, the lock simply falls open. Everything is smooth.
This lack of tension reduces the amount of kinetic energy being transferred between the various lock components. Additionally, with fewer moving parts in the lock, there is less that can go wrong.
You can skip this section if you’re only interested in escape room usage.
The Marine Brass 38 is a 5-pin lock. All of the pins are security pins (alternating serrated / spool pins). The keyway is narrow and paracentric (curved) like a European keyway. I can pick and rake it open (because the lock I have has fairly level pinning), but it certainly takes a lot more effort than any other lock I have found in the price range.
The shackle is held shut with ball bearings that prevent shimming.
The back of the keyway is shielded. I could not find any methods of bypassing, nor did I find anyone publishing information about possible bypasses.
Knowing that Master Lock No.1 – 4 can take a bullet, I have no doubt that this similarly designed Commando Lock can as well.
Lock Dimensions: 3 x 1.625 x 0.875 (inches)
Shackle Diameter: 0.5 (inches)
Shackle Height: 1.5 (inches)
Key Dimensions: 1.75 x 0.875 (inches)
Should I buy Commando Lock’s Marine Brass 38?
Manufacturing in Michigan, Commando Lock Company does a mindbogglingly good job of producing a high-quality, low-cost product. I keep hearing that it can’t be done in America, but damn it, they did it.
I’ve picked and opened this Marine Brass 38 somewhere in the realm of 500 times and it still opens like the day I pulled it from the box. This is not the case with the Master Locks that I own, which stick and seize up with regular use.
I feel confident recommending this lock for escape rooms because it truly feels up to the task.
We met the creator of these contraptions, Justin Nevins, at the Chicago Room Escape Conference back in August. His product was the darling of the tradeshow floor and he sold out before we could get our hands on one.
So we arranged to meet with Nevins in Seattle while we were visiting for PAX West.
There were three questions that we needed to answer about his device:
Could it stand the punishment of regular use in a room escape?
Could I pick it open?
Could his cryptex justify its $300 price point?
The problem with every cryptex tube that we had seen in a room escape was that it was easy to break and even easier to pick. Could Nevins’ cryptex be that much better?
Spoiler alert: Yes
Before we get into the intricacies of the cryptex tubes that are available, let’s cover a little history.
What’s a cryptex?
A cryptex is a tube with a combination letter lock built in as a self-locking mechanism.
Each of disks has all 26 letters of the alphabet etched into them. Any permutation of letters is possible. With 5 disks, this is 11,881,376 possibilities.
Where did the idea come from?
The concept came from Dan Brown in the novel turned movie, The Da Vinci Code.
Brown created a compelling fiction where it felt like the cryptex had been around for centuries, but it didn’t actually exist… yet.
Who created the cryptex?
Although Brown came up with the concept, the aforementioned craftsman Justin Nevins created the first cryptex. While driving across the country listening to TheDa Vinci Code on audiobook, the concept of the cryptex captured his imagination and he began conceiving ways to build one.
After a series of prototypes, in 2004 Nevins eventually created a durable cryptex that was fit for sale.
I wish I could have Hans Zimmer scoring my pensive puzzling.
The most common cryptex found in room escapes, this thing works pretty well out of the box, but eventually the innards buckle and it becomes flimsy and pickable.
At ~4 inches in length, this little guy has almost no capacity. Designers are usually stuck hiding small keys, bits of paper, or maybe a battery inside. It is limiting.
It also suffers from the same input problems as the piggy bank. Shifting one letter generally changes its neighbors. This really diminishes the psychological satisfaction of inputting a digit that you think is correct.
This is the official licensed Da Vinci Code cryptex (licensed by both the movie rights holder and Nevins).
It looks like the cryptex from the movie and generally feels better to operate than the previously mentioned tubes. It also comes in an attractive wooden box that is nowhere near rugged enough to survive life in a room escape.
But once again, this thing is subject to breakage after repeated use and it is pickable. Here’s a demonstration:
Variations on this picking method work on most of the other cryptexes.
The other big catch with this model is that it’s expensive. At nearly $200, you’re 2/3 of the way to Nevin’s $300 price point.
“Replica Line” is unfortunate branding for Nevins’ low-end Cryptex. It is a replica of his more elaborate products, but it’s an incredible, well-constructed, and aesthetically pleasing device.
Nevins gave us a Cryptex to review with a puzzle and a wager. If we could solve the puzzle and thus open it before we left Seattle, it was ours to keep. We had to solve it before flying home because this thing looks like a pipebomb when viewed through an x-ray machine.
His puzzle was devious and didn’t generate a word. Instead we ultimately derived five random letters and had to solve a different puzzle to sort their order.
This was a great test because it took us a few hours to solve the puzzle. When we hit a puzzling wall, we switched to brute-force and picking.
I tried every trick I knew to feel my way to an open, but the Cryptex gave away nothing. All picking attempts failed. Fortunately we eventually puzzled our way in. So consider this your disclosure that we received a free Cryptex from Nevins.
Since returning home, I spent hours trying to break into the Cryptex through picking and I absolutely cannot do it. I am reasonably certain that it’s possible to write some software to crack it, but that would be a massive undertaking and it would probably still take a lot of time to open it with a software assist.
How it works
From a room escape player standpoint, it works just like the others, only smoother. Input the correct combination, give the inner tube a little pull, and take your prize.
From a designer standpoint it’s easy to setup. The inner tube is static; the outer tube is where the magic happens.
The outer tube is made of 4 different types of components:
The frame (1) is the aluminum and brass structure that holds everything.
The disks (5) have brass outer rings with the alphabet on them and polycarbonate slotted inner rings with false slots (to torment pickers).
The spacers (5) are marble-patterned polycarbonate pieces that space the rings.(These spacers come in 6 different colors.)
The endcap (1) is an aluminum and polycarbonate piece that looks like a spacer, but has a locking mechanism to hold the outer tube together.
It is possible to special order a larger Cryptex with more disks.
If you want to change the combination, you take it all apart, pop the inner rings from the outer rings, and set it as needed.
To make sure that players can’t reset the box in game, Nevins has developed a technique to freeze the rings and make them virtually inseparable. Ironically, the technique actually involves putting the rings into a freezer.
It’s hefty, weighing 2 lb 12.7oz / 1.266 kg.
The outer tube measures:
length 8.3 in / 21.082 cm
diameter 2.375 in / 6.0325 cm
The inner tube measures:
length 7.95 in / 20.193 cm
diameter 1.62 in / 4.1148
It’s a much bigger cryptex than the others (except for the piggy bank).
It also comes in 6 different colors:
Why this is a superior cryptex
There are a number of factors that make Nevins’ cryptex a vastly superior device to the other tubes we’ve discussed.
It’s far more durable. It is made of solid materials that don’t have the opportunity to compact. As a result of this construction, it’s far less pickable. It’s possible that someone more skilled than I am could pick their way in, so I won’t say that it is unpickable.
The cryptex’s capacity increases options for what is hidden within it. This opens up additional design opportunities that the smaller tubes do not.
The color options are more varied and increase the odds that the cryptex will look like it belongs in the room. The Da Vinci Code-looking cryptexes almost never look like they belong in a space.
Lastly, Nevins stands behind his products and welcomes customers to contact him with any issues. He hasn’t needed to create a formal warranty program, but he will work with his customers to make things right should they go wrong.
$325 is a steal when you consider the constant replacement needed to keep the other cryptexes in working condition.
“But I want something even cooler”
If you want something fancier and money is no object, then Nevins offers more elaborate models.
The Nevins Line costs $1,000 – $2,500. It offers the same functionality as the replica, but with beautiful wood or stone materials.
For high rollers, the DaVinci Line runs upwards of $3,000 for some intense custom work and fancy materials. At this price point Nevins will create nested cryptexes… which I imagine are really cool.