Academics
ConveyorForge
A factory you can watch. Set the machines, run the belts, find where the line is waiting — then fill the order. Threefer turns 3 ore into 2 plates every 4 seconds: how many machines keep up? Too few and the belt backs up; too many and one sits idle. 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 Threefer
#1D4ED8 Characters who teach
Meet the cast
Every machine is a ratio with a personality. Threefer turns 3 ore into 2 plates; Gearwin presses 2 plates into a gear; Boxley packs 4 gears into a box; Snipper cuts 5 into 3; and Bottleneck Bea is where the line backs up - fix her stage and see where it waits next.
Threefer
turns 3 into 2 every 4 seconds
Gearwin
Presses 2 plates into 1 gear every 2 seconds
Boxley
Packs 4 into 1 box every 6 seconds
Snipper
Cuts 5 into 3 every 6 seconds
Bottleneck Bea
Where the line backs up - and when you fix it, the wait moves on
What's inside
Learning goal
A factory you can watch. Set the machines, run the belts, find where the line is waiting — then fill the order. Threefer turns 3 ore into 2 plates every 4 seconds: how many machines keep up? Too few and the belt backs up; too many and one sits idle. Ages 9–14.
Mentored by Threefer — no data leaves the device.
How ConveyorForge 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