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FlatForge
Unfold a crane and look where creases meet. Mountains and valleys differ by exactly two; alternate angles add to 180°. Predict whether a crossing folds flat, name the rule that proves it, then audit a confident assistant's crease pattern.
▶ Play it nowBuilt for sittings of about 25 minutes on the screen. That is our design budget, not a measurement.
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Live CCSS.MATH.CONTENT.HSG.CO.C.9 CCSS.MATH.PRACTICE.MP3 Hero color:
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Engagement:
What's inside
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Learning goal
Unfold a crane and look where creases meet. Mountains and valleys differ by exactly two; alternate angles add to 180°. Predict whether a crossing folds flat, name the rule that proves it, then audit a confident assistant's crease pattern.
How FlatForge handles your kid's data
- ✅ All progress, settings, and AI-generated content stays on the device
- ✅ No analytics, no tracking, no third-party SDKs
- ✅ Free — no ads, no in-app purchases
- ✅ No personal information collected from children — in line with COPPA (updated by the 2026 FTC amendments)
- ✅ No chat with strangers — play-together rooms use a short code and preset emotes, never typed messages