Academics
CastDojo
Design a cast, then test it on a younger kid. Pick a concept you truly know; invent six to twelve characters whose behaviour IS the rule; write chapter one; run a 15-minute playtest with a younger sibling or tutee; revise; export a cartridge you own. With a grown-up, you can send it to Spark & Anvil for review. Ages 15–18.
▶ Play it nowBuilt for sittings of about 25 minutes on the screen. That is our design budget, not a measurement.
#374151 Characters who teach
Meet the cast
Realistic teen cases, not cartoons: Lio, 16, whose first cast failed the swap test; and Esmé, 17, whose playtest with her little brother changed her chapter.
Lio
A 16-year-old designing a fractions cast - learns that a name is not a behaviour
Esmé
A 17-year-old who playtests with her brother - learns to watch more than she talks
What's inside
Learning goal
Design a cast, then test it on a younger kid. Pick a concept you truly know; invent six to twelve characters whose behaviour IS the rule; write chapter one; run a 15-minute playtest with a younger sibling or tutee; revise; export a cartridge you own. With a grown-up, you can send it to Spark & Anvil for review. Ages 15–18.
How CastDojo 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