Breach Protocol — a free cybersecurity strategy game
Breach Protocol is a free, browser-based cybersecurity strategy game. There's nothing to download and no sign-up — pick a side, choose a difficulty, and play instantly on desktop or mobile. It reimagines real security concepts as a fast, replayable tower-defense that you can approach from either side of the firewall.
Two ways to play
🔵 Blue Team — Defend
You're an analyst in a Security Operations Center. Waves of cyber-attacks — malware, DDoS floods, phishing, SQL injection, ransomware, zero-day exploits, and Advanced Persistent Threat bosses — race down the network toward your core. Deploy the right defense for each threat: antivirus, firewall, email gateway, web firewall, EDR/backup, or AI threat intel. Every defense is strongest against one kind of attack, so reading each wave and mixing your layout is the whole game.
🔴 Red Hat — Attack
Flip sides and play the hacker. Spend intel to launch the attacks the enemy's defenses can't counter, breach their core, and keep your Trace meter under 100% before the blue team pins your location. The AI defender adapts and reinforces over time, so timing — and your DDoS Surge and Zero-Day tools — decides whether you get in clean.
How to play
- Choose a side (Blue Team or Red Hat) and a difficulty: Rookie, Analyst, or Red Team.
- Blue Team: click a defense, then click a glowing tile to place it. Open the inspector to upgrade or sell.
- Red Hat: click an attack to launch it at the enemy network, and trigger your abilities at the right moment.
- Controls: mouse or touch. Keyboard hotkeys —
1–6build/launch,Q/Wabilities,Fspeed,Ppause,Spacestart,Esccancel.
Features
- Two complete game modes — defend or attack.
- Six threat types plus APT bosses, countered by six defenses with a clear strengths-and-weaknesses system.
- 65 unlockable achievements with saved progress and best-run records.
- A smart, self-escalating AI, tower upgrades, special abilities, and an in-game economy.
- Plays instantly in your browser on desktop and mobile (landscape) — no install.
A hands-on way to learn the basics
The threats and defenses in Breach Protocol mirror the categories real security teams deal with every day — from phishing and ransomware to zero-day exploits and persistent attackers. Playing both sides is a light, low-stakes way to build intuition for how network attacks and defenses play off one another.