Spark & Anvil Privacy

Ages 9–14 · Grades 4–8 · Computer Science

RailForge

The cart waits at the start, facing the track. Tap to run move().

Read the little program, predict the route the mine cart takes to the ore, then watch it drive.

A built-in solver checks every puzzle really can be solved (and tells you the shortest program). Every route you see is drawn by really running the code. Runs on your device; nothing leaves it.

Meet the cast — the characters who teach this

  • Railwright builds tracks before driving them — you teach her to drive every cell
  • Trackley remembers which way the cart faces after a turn
  • Tunnel knows a keep-going loop stops at the first thing in the way
  • Par counts the cells and the repeats until they match

What next? Pick a door

Chosen from what this app is about. What you open is remembered on this device only.