Cybersecurity Experts
Hidden state, deduction by elimination, and a long memory for prior signals.
Defence is a deduction game played against an adversary who is also deducing. You have partial information, you propose a hypothesis, you eliminate candidates · same engine as Mastermind, applied to log lines.
Recommended games
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Brute Force
One button to attack Satoshi's vault · Brute force 256-bit private keys and hunt for Satoshi's 1.1M BTC
Brute ForceOpen game Loading… -
Walk to Satoshi
Walk the right path and win one million Bitcoin! (Kind of) · Walk the 256-bit binary tree to Satoshi's vault
Walk to SatoshiOpen game Loading… -
Hash
The logic black-box · feed inputs, watch outputs, deduce the hidden function. From simple alphabet shifts to positional math rules
HashOpen game Loading… -
Mastermind Deduce
Crack the secret code from past guesses and peg feedback. Pure deductive reasoning, cheat-proof validation
Mastermind DeduceOpen game Loading… -
Privacy Hacks
Source-verified digital-privacy and security steps from CISA, the FTC and the EFF
Privacy Hacks -
Circuit Breaker
Choose the logic gate · AND, OR or XOR · that turns the two inputs into the target output
Circuit BreakerOpen game Loading… -
Cheat the System
Read a small rule system and spot the loophole · pick the strategy that exploits it, then learn the incentive-design idea behind the flaw
Cheat the SystemOpen game Loading…
Why these games
Mastermind Deduce is the canonical hidden-state reasoning drill · narrow the candidate set with each piece of evidence. Memory Game keeps the indicator-of-compromise pattern bank fresh. Facts is the threat-intel drill · the long tail of CVE numbers, malware families, and protocol footguns that have to be retrievable in seconds during an active incident.