Red Planet

A rover has landed on Mars. A message from Earth can take more than 20 minutes to get there, so nobody can drive the rover live. Dr Amna at mission control needs a programmer. Write the whole program in Cambridge pseudocode, send it, and watch the rover follow your code one line at a time.

1. Read the mission. Dr Amna tells you the goal.
2. Write your program. Tap a rover command to add it. Type == to get ←.
3. Press Send program. Watch each line run. The variables and the trace table fill in.
4. Some missions have more than one map. The same program must work on all of them.
5. Win the Size medal with few lines of code, and the Speed medal with few steps.