Ocean Rescue: Variables

A real assignment from our Python Quest course, rebuilt step by step in your browser.

A variable is a labeled box that holds a value — a number, a color, a word — that your code can read and change.
Instead of writing 90 everywhere in your code, you write SUB_WIDTH once. Change that one line, and every part of the game that uses it updates automatically.
This is the very first idea every programmer learns — and almost everything else in code is built on top of it.

You'll start with an empty ocean and a plain submarine — no movement, no game yet.
Over 10 short steps, you'll turn on movement, treasure, trash, lives, a timer, and difficulty — by editing real variables, one at a time.
By the last step, you'll have rebuilt the actual Ocean Rescue game taught in Python Quest.