Math CAPTCHA
A simple math problem that serves as a visible fallback when the invisible Proof-of-Work challenge cannot be completed.
Difficulty Levels
Easy: Addition with numbers 1–9 (e.g., 3 + 5 = ?)
Medium: Addition and subtraction with numbers 1–15 (e.g., 12 − 7 = ?)
Hard: Addition, subtraction, and multiplication with numbers 2–15 (e.g., 6 × 3 = ?)
Features
- Available in 25 languages
- Text-to-speech function for accessible use
- Maximum 5 attempts before blocking
- Difficulty adapts to the behavior score
- No time limit — users can take as long as they need