One hour. Five mind-bending activities. By the end you'll have read minds with binary, thought like a processor, raced algorithms, built logic circuits and written code that calls itself. Welcome to A Level Computer Science.
Think of a secret number from 1 to 31 — don't tell anyone! For each card below, say whether your number is on it. The computer will read your mind. 🧠
A ready-to-run plan. Every activity links to a real interactive tool on this site — no installs, no logins.
The computer guesses your secret number. Then the reveal: it was binary all along. Everything a computer does starts with on/off — and you just did it in your head.
Teacher: Big question to open with: “How does a computer store the entire internet, every photo, every song… using only two symbols?”
A Level CS is not “more coding lessons”. It is four huge ideas: the machine underneath, the algorithms that power everything, the data & AI revolution, and the deep theory of what computers can — and can’t — do.
Teacher: A Level is where you stop being a user and start understanding the magic. You’ll build, break, and reason about real systems.
Meet the Little Man Computer — a tiny model of a real processor. Load a program, then watch it fetch, decode and execute one instruction at a time. This is literally how the chip in your phone works.
Teacher: Run the “add two numbers” program and step through it. Ask: where is the data? where is the program? (Same memory — that’s the von Neumann idea.)
Why is one method of sorting thousands of times faster than another? Watch bubble sort crawl while merge sort flies — then send a robot through a maze to see how satnavs and games find a path.
Teacher: The race: same data, two algorithms. Efficiency is the whole game at A Level — and the reason Google can search billions of pages in milliseconds.
Every decision a computer makes is built from three tiny switches: AND, OR and NOT. Wire them together and you can build adding machines, memory… eventually a whole computer.
Teacher: Build a circuit that only lights when two conditions are true. Mind-blower: a modern CPU is billions of these gates etched into silicon.
Try a real A Level idea: recursion — a function that calls itself. It feels like magic the first time it works. Crack the factorial challenge in Python Quest, right in your browser.
Teacher: No installs, no setup — write Python, hit run. This is the gamified course you’ll have access to all the way through Year 12 and 13.
Recap the four big ideas, take questions, and hand out the summer mission. They came in as users; they’re leaving as people who’ve thought like a processor, raced algorithms, built logic and written recursion — in one hour.
Teacher: End on the future: AI, cyber-security, games, robotics, research — A Level CS is the key to all of it.
Turn up in September having beaten one full world of Python Quest. It's free, it's gamified, and it runs in your browser. Get a head start and you'll fly through the first term.
Can't wait to see you in Year 12. It's going to be brilliant. 🚀