STEM
CreaseForge
Every time you fold a piece of paper, you are doing geometry: the crease is a mirror, and whatever was on one side lands as its reflection on the other. Fold across a line and a dot mirrors straight over it; fold one edge onto another and you bisect the angle exactly - no protractor. Predict where a fold lands, then mirror a point yourself in the lab. Real, tiny, deterministic maths - no internet. Ages 9-14.
▶ Play it nowBuilt for sittings of about 20 minutes on the screen. That is our design budget, not a measurement.
Meet your mentor
Every Spark & Anvil app has a friendly mentor character that demonstrates, asks, and patiently scaffolds learning.
Mentored by Axis
#7c4dbb Characters who teach
Meet the cast
CreaseForge's crew are the folds that make a mirror: Mira is the crease itself, Valley sends a point to the same distance on the far side, and Bisect folds an angle exactly in half. Axis the origami fox counts a shape's lines of symmetry.
Mira
The crease - a line of reflection, so whatever sits on one side of the fold lands as its exact mirror image on the other
Valley
A single fold, which mirrors a point across the crease to the opposite side, the same distance away - every fold is a reflection
Axis
Counts a shape's lines of symmetry and keeps the crew's rule: a regular n-gon has exactly n folds that map it onto itself
Bisect
Matches one edge of an angle onto the other, so the crease lands exactly halfway between them - folding an angle precisely in half
What's inside
Learning goal
Every time you fold a piece of paper, you are doing geometry: the crease is a mirror, and whatever was on one side lands as its reflection on the other. Fold across a line and a dot mirrors straight over it; fold one edge onto another and you bisect the angle exactly - no protractor. Predict where a fold lands, then mirror a point yourself in the lab. Real, tiny, deterministic maths - no internet. Ages 9-14.
Mentored by Axis — no data leaves the device.
How CreaseForge 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
For you, the grown-up
Spark & Whetstone, our free site for grown-ups, tells what CreaseForge teaches in a short course of its own.