Gallery of Defusable Clocks and Game Timer Pro Builds

Have you built an awesome Defusable Clock or Game Timer Pro? Send your images/videos to info@nootropicdesign.com and tell us how you built it! Scroll to the bottom for the newest builds.


This clock was made by covering 7 wooden dowels with brown paper. The dowels are 1 inch (2.5cm) in diameter, and 9 inches (23cm) long The paper is from a paper lunch sack. The dowels are held together with black electrical tape.

Wood dowels are cheap and readily available at home improvement stores like Home Depot or Lowe's.

This clock was made to look like C4 plastic explosives. It's really just gray modeling clay.
Contributed by Matt in Blaine, Minnesota, USA

Check out the Defusable Clock bolted to the side of a 50 caliber ammunition case. The liquids inside the jars are simply colored soap solution. Nice work, Matt! Here is a great writeup of the project details.
Contributed by Daniel in Barcelona, Spain

This is an epic build inside a steel briefcase. A nice cover conceals the internal circuitry. Don't take this anywhere near an airport!
Inside is a battery holder that has C4 explosive labeling on it. Nice touch.
The device is powered by six C cell batteries wired in series to provide 9V. This bomb is going to be used in an Airsoft bomb scenario, so battery power is important.
Contributed by Andy in Platteville, Wisconsin, USA

Simple, but pretty nasty looking. This clock uses two 6V lantern batteries to provide 12V to the clock. A simple 2.1mm DC plug from Radio Shack made it easy to connect the batteries to the clock. Andy plans on using this for paintball scenario games. Don't get in trouble!
Contributed by Tucker in Santa Barbara, California, USA

Tucker did a fine job building this dynamite Defusable Clock, and did an even better job photographing it. Can you tell that Tucker is a photography student specializing in product advertising?
"Dharma" is a reference to the Dharma Initiative in the television series Lost.
Contributed by Dave in Orlando, Florida, USA

The guys at Combat City, an Airsoft battlefield, put together this freaky-looking device. "Use Caution" -- no kidding!
Contributed by Ryan in Auckland, New Zealand

The team at Judd Studio Engineering in New Zealand did a fantastic job with this clock. It's made from a rake handle and a roll of brown paper. They ruffled up the paper a bit before feeding it into a laser printer.
Now, that is some authentic-looking dynamite. A fine effort, indeed.
Contributed by Dave in Orlando, Florida, USA

The guys at Combat City are at it again. This time they've made a suicide bomber vest to use in their Airsoft scenarios. It looks like they've enclosed the clock in a plastic box for protection. Good job, and never take that vest anywhere, ever.
Contributed by TeamAWS in Los Angeles, California, USA

The TEAM AWS Airsoft team built a great device in a steel suitcase, which they affectionately call "The Burrito". They modified the software to have a higher countdown value and the timer starts when the case is opened. They also amplified the sound with a speaker. Great build, guys.
Wow, there's a lot going on in here.
They added a component that has 4 disposable flash bulbs which flash when the bomb detonates. The flashing can even be activated remotely to distract the defuser! Now that's innovation.
Check out this video to see it in action. This was made before the flash unit was added.
Contributed by Claude in Cousances les Forges, France

This looks scary even when the suitcase is closed!
This looks like a very powerful device. Very rugged. The luggage inspectors at the airport would not be pleased...
Contributed by Phil in San Francisco, California, USA

Phil and his daughter built this great device that looks like a pipe bomb. But this is no ordinary pipe bomb -- it has a secret...
It is actually a secret compartment for storing valuables! No burgler is going to mess with this.
Contributed by Max in Rome, Italy

Max and his airsoft club "Italian Tactical Troop" built this great suitcase bomb which is affectionately named "Monica".
Indeed, Monica is very beautiful!
Contributed by Scott in Minneapolis, Minnesota, USA

Scott used a 3D printer to print something called "The F-Bomb". If you look closely, there's an 'F' on the side of the large bomb shaped 3D print. Nice!
Contributed by Chuck and Scott in Los Angeles, California, USA

Chuck and Scott are experienced prop builders in Southern California and have built this amazing bomb. According to them, the "bomb" must be kept at very low temperatures or it will realease a highly toxic gas into the air! They have a great video here!
Contributed by Lorenzo in Genova, Italy

This device is used in weekend airsoft games by the Corsari ASG Team in Genova, Italy. But during the week, it serves as Lorenzo's bedside alarm clock!
Contributed by Todd in Winnipeg, Manitoba, Canada

I like the FAT yellow wire leading to the detonator.
Contributed by Urs in Munich, Germany

Simple, but nice. Notice the skull and crossbones symbol on the dynamite.
Contributed by Kip in Las Vegas, Nevada, USA

This package would certainly be a surprise to anyone! Nice work, Kip, and don't send this crate to anyone.
Contributed by Chris in Houston, Texas, USA

Chris did his research to create a very authentic dynamite label. He used 3/4" PVC pipe because the outer diameter of the pipe is about 1". Very nice.
Contributed by Paul in Brooksville, Florida, USA

This one has two detonators, one at each end!
Contributed by Andrey in Kirzhach, Russian Federation

Andrey and his airsoft team "Whiteberry" did an amazing job with this build. Notice the customized ABS enclosure. The display is protected with 3M LCD protective glass. They also added a dynamic speaker for high volume. Don't forget to watch the video below!
Nice case!
You won't believe this video. I watched it over and over! Watch it in full-screen mode. The titles are in Russian, but I don't care -- it's simply awesome!
Contributed by Fabiano in Verona, Italy

This contribution comes from the Airsoft team GHOST SOFTAIR VERONA. They used 7 paper cylinders 33cm long and 4cm in diameter. Nice job guys.
The cylinders are closed at the ends with plastic plugs. The center cylinder holds a 9.6V 1600mAH NiCd battery to power the clock.
Contributed by Mark in Colorado Springs, Colorado, USA

This picture really tells a story. Mark and his kids built this as a Christmas present for his brother in the 82nd Airborne Division of the U.S. Army. The plastique is made of modeling clay wrapped in clear tape, and the blasting caps are wire connectors.

In case you are wondering, that's a real AK-47 in the background. Thanks a million, Mark.

Contributed by Jason in Manchester, New Hampshire, USA

This is a pretty classy-looking bomb in a nice cigar box. Jason wanted to make somemething that looks like a biological threat -- I'd say he succeeded!
Contributed by Dave (a.k.a. "Jake Blues") in Wellington, Ohio, USA

Dave (or should I say "Jake Blues") created this menacing scene with a wine bottle box, wood dowels with a photoshopped dynamite label, and some copper plumbing caps. And why not include a pistol for a more dramatic effect?
Contributed by Gamepod Combat Zone in Antioch, California, USA

This Airsoft facility (the largest in the world at 120,000 square feet!) uses this device to delight their customers. They added a 13-pin keypad to activate a relay that powers up the "bio weapons canisters". The even made a second board with a relay that controls a 130 dB siren. Great job!
Contributed by Edward and Conrad in Columbia, Missouri, USA

These guys from Regulators AirSoft built this prop to use in an arena in Springfield, MO. I wonder what's inside this nice looking case...
The canister is made with red transparent .12 gram BB's with two dozen strip red LED lights used for R/C Airplane night flying. Mock C-4 is made of clay. Power comes from a CPU power supply with a 11.1V Lipo battery. Blasting charges are made from .223 shells. Each switch has a function: power to cooling fan, power to canister, and power to all lights. The light around the power box is from a landing light kit from nitroplanes.com. What a fantastic build!
Contributed by Niklas in Storuman, Sweden

Action Events Sweden created a great prop for their Airsoft events. There are 4 wires that the participants can cut to try to defuse the bomb. The Defusable Clock circuit is expertly installed underneath a panel with the display showing through a cutout.
Contributed by Matt in Atlanta, Georgia, USA

Matt built this great device as a surprise birthday gift for his wife who is a big fan of the TV show NCIS. At the end of a treasure hunt, she had to defuse this device! It is made from PVC pipe wrapped in custom labels printed on red paper. Great job, Matt, and what a thoughtful gift!
Contributed by David in Mountain View, California, USA

David and his 9 year old daughter built this wonderful device from old wine keeper nitrogen tanks and old plumbing supplies. His daughter did all the soldering herself (nice job!). This is definitely one of my favorite contributions, and gets extra points for originality.
Contributed by Tim in Christchurch, New Zealand

Tim has a new bedside clock to wake him up in the morning. WAKE UP, TIM!
Contributed by Rick in Dunbarton, New Hampshire, USA

Rick built a classic C4 plastic explosive device using plasticine clay. Notice the mercury tilt switch from an old thermostat on the top of the device. It is connected to the detonation button, so if you don't handle this carefully, you will start the countdown sequence automatically! Besides, the mercury switch makes it look cool.
Contributed by Neil in Hoddesdon, UK

Neil with Fenland Airsoft in England made this great MILSIM prop. He added lots of hardware like two key-switches, a motion sensor, and a relay-driven siren that will make your ears bleed. His device has special software that causes the countdown to speed up when the wrong wire is disconnected! For all the details, watch his extremely comprehensive video.
Contributed by Mike in Tijeras, New Mexico, USA

Mike built this excellent movie prop for a film of some sort, and I think it looks great. The studio owner he was working with liked it so much that he offered to buy it!
Contributed by Hercules in Staten Island, New York, USA

Hercules (yes, that's his real name) runs a big airsoft and paintball facility. He's really taking these devices to new levels.
Super scary looking...
Nice build in a very professional looking case!
Contributed by Brian in Cary, North Carolina, USA

Brian built a classic dyamite unit that he will put to good use...somehow.
Contributed by Rob in Whitby, Ontario, Canada

Rob used an old electric typewriter case and added a clear plexiglass cover. A stainless steel thermos makes a very convincing explosive container.
Rob is using this device in an "escape room" game where the competitors must solve a series of puzzles, ultimately needing to unlock this case and cut the correct wire to defuse the bomb!
Contributed by Annette in Arizona, USA

This is one of the most amazing builds we've seen so far. This is intended as a movie prop and there's plenty of awesomeness going on here.
Annette wrote that this is "built largely out of laser-cut acrylic, with the cylindrical chassis made of 3" ABS drain pipe. I raided my junk box (and other people's junk boxes!) for assorted cool-looking parts to tack on."
There a lot more info about this project in the Instructables article that she wrote up. Lots more pictures! Great work!
Contributed by Pavel in St. Petersberg, Russia

Pavel built this device for a museum exhibit in St. Petersberg. He's got wires rigged to start/stop a video. It looks like museum visitors get to control a robot to try to defuse the device. WOW.
This looks like a lot of fun!
Contributed by Jason in Naven, Ireland

Jason built this rugged device for use in Airsoft games in Ireland. He modified the code so that the wires need to be disconnected in a particular order. The user needs to look up the sequence in a code book. Talk about pressure! Nice job, Jason.
Contributed by Sander in the Netherlands

Sander built this device for an Airsoft game obviously. Excellent build, Sander.
A glowing biohazard device? We approve.
Contributed by Andrew in Athens, Georgia, USA

Andrew has an escape room business called "Escape the Space". He uses the Defusable Clock in the SWAT themed room. There's a Raspberry Pi, graphics card, and phony dynamite and C4. The game participants have to solve a puzzle to open the locked case. Then...surprise!
Contributed by Nathan in Aurora, Colorado, USA

A traditional look, this device has PVC pipe stuffed with clay and then wrapped in paper. This looks really rugged!
Stay out of trouble, Nathan.
Contributed by Alessandro in Tolmezzo, Italy

This beat-up metal case with radioactive symbols and reflective tape looks great!
The case is full of surprises, of course. Plenty of warning labels and more reflective tape. Nice job Alessandro. Stay out of the airport.
Contributed by Kevin in Saskatoon, Saskatchewan, Canada

Once again, a beat up metal case is always a great starting point for a Defusable Clock build. The broken handcuff on the handle is a hint that something is amiss. Airport authorities would definitely consider this to be an "unattended bag".
Kevin gets the award for curliest wires. Looks great!
Nice details on the ends of the dynamite sticks. This is a well-crafted project, for sure. This is scary as hell.
Contributed by Michel in Vlaardingen, Netherlands

This is the most sophisticated suitcase Airsoft bomb prop of them all. There is so much going on here, you need to watch the video below to take it all in. At nootropic design, we are speechless. Ladies and gentlemen, we have a winner.
The top half of the case has an illuminated scoreboard with some extremely cool lighting animation.
Watch this video to see all the action!
Contributed by "scorched" in Virginia, USA

This project was for CZ Airsoft in Fredericksburg, VA. It's mainly made from 3/4 inch PVC pipe with end caps. The board is raised on 200mm standoffs and hot glued to a wrap and base of thermoplastic all the way around the pipe to keep it rigid. Around the standoffs is another thermoplastic wrap to form a small battery holder compartment with a velcro front. Nice!
In order to allow many uses without cutting wires, notice that the wires are outfitted with DC-022 power jacks and plugs. That's a great way to make it reusable.
Contributed by Ivars in Valmiera, Latvia

Ivars and his Airsoft buddies in Latvia are having a lot of fun. There is a lot going on in this crazy suitcase bomb. I can hardly tell which end is up.
A window in the side of the case to show the countdown is a nice touch. I don't think we've seen that feature before!
Contributed by Chris in Stafford, Texas, USA

Chris, this is a solid build. Great job on the dynamite, and those switches are awesome. The big red button look soooooo inviting...
Contributed by Andrew from Alberta, Canada

Andrew has sent a picture of his new device named "Ultimatum". That's a perfect name for this awesome device, and I don't want to hear the "or else" part of the ultimatum! The tube has green airsoft BBs and is lit by a green and a white led strip. The circuit boards are from old cell phones and laptops, with wires soldered to them. That's a great use for old electronic waste -- thanks, Andrew!
Contributed by Valentin from Besné, France

Valentin got a Game Timer Pro to build a prop for his Airsoft club in France. It sounds like everyone is happy with it -- great job on this! Notice the microswitch on the right side of the case. This way the countdown can start when the case is opened. Surprise!
Contributed by Scott in Charlotte, North Carolina, USA

Scott runs Escape Tactic in Charlotte and the Defusable Clock is part of one of their amazing escape rooms called Flight 282. Wow, this looks fun!
Look at this incredible build-out of an airplane cockpit! Wow, wow, WOW!!!
Contributed by Beppe in Pavia, Italy

Obviously Beppe knows what he is doing. Look at this Italian craftsmanship! He wanted the noise output to be louder so he connected an amplifier and speaker to the external pads for the audio output.
By connecting jumper wires from the terminal blocks to toggle switches, he made it much easier to use and reset. Great work.
Contributed by Michael in Margate, Florida, USA

Just when I think I've seen the best Game Timer Pro build, someone blows me away (no pun intended). Click on the image for the full-size view, and feast your eyes! Thanks so much, Michael.
Here is a video of this amazing suitcase build.
And this one really is a masterpiece of metal machining! Some details from Michael: The relay was used to activate a 12V, 7 RPM motor that rotated a double helix coil built inside a 6 spoke cage with a driveshaft to rotate it. Additionally the sound was added with a 10W amplified MP3 trigger that activated an SD card programmed with a custom made sound file built in Audacity. A 12W speaker is mounted underneath to supply the theatrical sound effects. The front control panel was machined out of aluminum sheet and the LCD was mounted behind with the keypad. The unit was encassed with clear lexan on the front and back and aluminum sheet on bottom. An LED light strip was used to illuminate the device upon activation from the 12V circuit. Two key switches, LCD lighting, motor, terminals, and flashing circuit complete the build.
Contributed by Florian in M├╝nchberg, Germany

This "suitcase nuke" looks awesome! I love the detail of the nuclear device and the Cyrillic script. This sure looks like a nuke that got loose when the Soviet Union collapsed. Florian did a lot of custom 3D printing to make this happen -- a fine job, indeed.