Rover

Mission: write real Python to drive a rover across the surface, collect every rock, and reach the landing pad. The computer does exactly what you wrote — nothing else.

Problem solving with code

Checking whether this computer can save your work...

PICK A LEVEL

THE SURFACE

Write your program, then press RUN.

2 · your program0 lines

COMMANDS

Click one to drop it straight into your program above.

THE BRIEF

How Rover works

This is real Python. Same words, same brackets, same indentation as the programs you write in class — it just drives a rover instead of printing text.

Pick a level. Read the brief on the right.
Write your program in the box. Click a command underneath it to drop it in.
Press RUN and watch. The rover does exactly what you wrote, in order, from the top.
Crash into a wall? That is not a punishment — it tells you which line was wrong.
Every level has a target number of lines. Beating it usually means using a loop instead of copying and pasting.
Landing a level unlocks the next one. Every level is built on the one before it.
The rover can be asked five questions: wall_ahead(), wall_left(), wall_right(), on_rock() and at_goal(). Later levels are unsolvable without them.
def gives a name to a group of lines, and elif chains a second question onto an if. Both are ordinary Python and both turn up near the end.

Indentation is not decoration. Lines inside a for or an if must be pushed in with four spaces. Get that wrong and Python stops — exactly as it does in your real programs.