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Free to Play

Can you trick the AI?

A free AI security CTF: prompt injection challenges for hands-on practice.

Free challenges that get harder as you go. 6 levels. 3 difficulty modes. Free to play, free account to track your progress.

6 challenges that get progressively harder — can you beat them all?
Great for learning, team workshops, or just having fun
Completely free, forever. A free account tracks your progress.
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6 Progressive Levels

SentinelGoat is designed to validate offensive AI intuition across realistic escalation paths, not just toy prompt puzzles.

01Easy
Basic Prompt Injection

Simple prompt manipulation to extract the hidden flag.

02Easy
Keyword Filter Bypass

Evade keyword detection using encoding tricks.

03Medium
Document Exploitation

Exploit document processing to leak secrets. PDF/HTML/JSON.

04Medium
Image Steganography

Extract hidden data from images using vision AI.

05Hard
Audio Forensics

Analyze audio for hidden information and voice commands.

06Hard
Guardrail Bypass

Defeat secondary AI safeguards. Advanced prompt injection.

Three Difficulty Modes

Each mode uses a different AI model profile so the challenge can work for onboarding, serious practice, and expert-level drills.

Darlene
Easy

gemini-2.5-flash-lite

Forgiving guardrails. Good for learning.

Whiterose
Professional

gemini-2.5-flash

Balanced difficulty. The main challenge path.

Elliot
Expert

gemini-2.5-pro

Strongest guardrails. For the hardcore.

Multi-modal

Text, image, audio, documents

Challenge Signal

Progressive difficulty with real AI failure modes

Accessible

Free product for onboarding and community growth

Real AI

Live Gemini-backed challenge behaviors

Ready to start?

Play SentinelGoat for free, or level up to hands-on cloud labs with FreakLabs.

Play NowExplore FreakLabs

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