SpookyQubitsAll collections COLLECTION 02 · MADE FOR YOUR PHONE
Secrets have a way of leaving traces.
Play with the science of sending, listening, and knowing when to trust.
Solo or together · No account · No app to install
THE SPOOKY SIGNALS GAME LIBRARY
Audit a secret in Ghost Mail, or relay a hidden state in Ghost Relay. Each mission has its own rules, lab, and guide.
Quantum key distribution
How much of a secret will you give up to test it?
Test a possible key as the Courier, or listen as the Spy. Spend bits on evidence, decide whether to deliver, then reveal who knew what.
Solo Courier · Solo Spy · Pass & Play
Quantum teleportation
Can you deliver an unknown state without keeping a copy?
Receive two classical message bits, choose Flip and Sign corrections, and save your resend stamps for a troublesome line. Reveal what made the transfer work.
Solo Operator · Two Players · Three Players
Download the Spooky Signals classroom collection ↓ · All completed games and guides.
SOLO OR TOGETHER · ONE PHONE
Audit a key or play the Spy in Ghost Mail. Handle the radio and receiver’s corrections in Ghost Relay.
Take private turns as Courier and Spy, or Sender, Courier, and Receiver. Both games guide the handoffs. Swap roles after a shift.
Make a choice before opening the hidden record. Compare what happened with what your evidence could actually tell you.
2–3 players use one shared device. Private turns use cover screens and an honor system.
FROM A PREDICTION TO A PATTERN
Ghost Mail’s Signal Lab compares measurement bases and eavesdropping. Ghost Relay’s Relay Lab explores what Bob can know with no message, one bit, or both.
Ghost Mail · Signal Lab →Ghost Mail models BB84 key distribution and intercept-resend attacks. Ghost Relay models teleportation with a shared entangled pair, two classical outcome bits, and conditional corrections.
These are classical simulations. Game points are teaching rules, and simulator replays reveal information that real participants do not have. Read the sources and model limits in each guide: Ghost Mail ↗ · Ghost Relay ↗.
KEEP EXPLORING
Waves, signed coins, spooky boards, search, and error correction.