The Engineer's Challenge bundle by Puzzlocks featuring the PicoLock and Loki brass sequential discovery puzzle locks with keys
A hand holding the 40mm wide PicoLock to demonstrate its portable size. An engaging, high-value pocket challenge designed to get people off their phones and focused on spatial logic reasoning.
The PicoLock brass sequential discovery puzzle lock by Boaz Feldman with key, compact but surprisingly complex
The PicoLock pocket-sized mechanical puzzle lock showing its complex design and included fabric bag. A compact yet highly challenging brain teaser included in the ultimate collection bundle.
The Loki brass sequential discovery puzzle lock by Boaz Feldman with key, an expert level puzzle that takes an average of 18 hours to solve
The Loki brass puzzle lock by Puzzlocks on a black background with the yellow Puzzlocks keyhole logo
Close-up of the Loki by Boaz Feldman and its keys — praised by puzzle experts like Chris Ramsay as one of the toughest locks around.
The Engineer's Challenge bundle by Puzzlocks featuring the PicoLock and Loki brass sequential discovery puzzle locks with keys
A hand holding the 40mm wide PicoLock to demonstrate its portable size. An engaging, high-value pocket challenge designed to get people off their phones and focused on spatial logic reasoning.
The PicoLock brass sequential discovery puzzle lock by Boaz Feldman with key, compact but surprisingly complex
The PicoLock pocket-sized mechanical puzzle lock showing its complex design and included fabric bag. A compact yet highly challenging brain teaser included in the ultimate collection bundle.
The Loki brass sequential discovery puzzle lock by Boaz Feldman with key, an expert level puzzle that takes an average of 18 hours to solve
The Loki brass puzzle lock by Puzzlocks on a black background with the yellow Puzzlocks keyhole logo
Close-up of the Loki by Boaz Feldman and its keys — praised by puzzle experts like Chris Ramsay as one of the toughest locks around.

The Engineer's Challenge - PicoLock and Loki Bundle

  • Sale
  • $319.00
  • $338.00
Shipping calculated at checkout.

🔐 Two Sequential Discovery Puzzles. One Serious Challenge.

Engineers are wired to figure things out. They look at a problem and want to understand exactly how it works. These two puzzles are built for that kind of thinking.

The Engineer's Challenge pairs the PicoLock and the Loki - two sequential discovery puzzles that unfold in stages. Each step reveals something new. Getting through all of them requires the kind of patient, methodical thinking that engineers are good at.

🔬 The PicoLock - Small But Seriously Impressive

Do not let the size fool you. The PicoLock packs a serious sequential discovery challenge into a compact brass frame. Engineers tend to love this one because the mechanism is genuinely impressive once they work it out.

  • ⏱️ Average solving time: 8 hours
  • 🎯 Difficulty: Beginner to Intermediate
  • 🔩 Material: Brass

😈 The Loki - The Ultimate Challenge

The Loki is our most challenging puzzle. It is built for people who have solved everything else and need something that will genuinely test them over multiple sessions. 18 hours is the average. Some people take longer. Nobody gives up easily. That is the whole point.

  • ⏱️ Average solving time: 18 hours
  • 🎯 Difficulty: Expert
  • 🔩 Material: Brass

🎁 Who Is This Bundle For?

The Engineer's Challenge is the perfect gift for engineers, architects, developers, and anyone who loves figuring out how things work. If the person you are buying for has already solved other puzzles and wants something that will genuinely test them, this is it.

Works great for birthdays, work anniversaries, or any occasion where you want to give something that treats the recipient's brain as the gift.

📦 What's Included

  • 🔬 PicoLock puzzle lock
  • 😈 Loki puzzle lock
  • 🛍️ Two fabric carrying bags
  • 📑 Two instruction cards

⚙️ Bundle Specifications

  • ⏱️ Total average solving time: 26 hours
  • 🎯 Difficulty: Beginner to Intermediate and Expert
  • 🔩 Material: Brass

💰 Bundle Savings

Save $19 compared to buying the PicoLock and Loki separately.

⚠️ Safety

Contains small parts. Keep away from children under 3.