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Sequences and Loops: Code a Robot and Squash the Bugs

Sequences and Loops: Code a Robot and Squash the Bugs

Learn how sequences and loops make programs work by coding Beep the robot across a grid, predicting his moves and fixing buggy code.

  • Ages 7–9
  • About 40 min
  • Easy start
  • Coding
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What you'll learn

  • What a sequence is and why instruction order matters
  • How inputs go into a computer and outputs come out
  • How a repeat loop runs a group of blocks again
  • Choosing the right number of repeats for a loop
  • Tracing code step by step to predict what it does
  • Debugging: run it, find it, fix it, test it

Chapter by chapter

  1. Sequence: putting instructions in the right order Free to try

    Years 3–6 computing · 1

  2. Repetition: using repeat loops in programs

    Years 3–6 computing · 1

  3. Logical reasoning: predicting and explaining what code does

    Years 3–6 computing · 2

  4. Debugging: spotting and fixing errors in programs

    Years 3–6 computing · 2 Years 3–6 computing · 1

  5. Code Master Challenge (8 questions)

What the chapters cover in the national curriculum in England:

  1. Years 3–6 computing: Use sequence, selection, and repetition in programs; work with variables and various forms of input and output
  2. Years 3–6 computing: Use logical reasoning to explain how some simple algorithms work and to detect and correct errors in algorithms and programs

About this adventure

Sequences and Loops is an interactive coding game that teaches children aged 7–9 how to put instructions in order, use repeat loops, and find and fix bugs in programs. It follows the KS2 computing curriculum and is pitched at Year 3.

Players write programs for Beep, a little robot on a grid, using Forward, Turn left and Turn right blocks. They watch each block run in turn, and see that changing the order changes where Beep ends up. Then they swap long rows of repeated blocks for a single repeat loop and choose how many times it runs.

Along the way they trace code one block at a time to predict where Beep will stop, and explain why he moves as he does. Spoken narration, captions and sound effects guide every step, and short animated scenes introduce each new idea.

Questions and answers

What is a sequence in coding?

A sequence is a set of instructions that a computer carries out one at a time, in order, from the start. If you change the order, the program can do something completely different, even when it uses exactly the same instructions.

What is a loop in programming, in simple words?

A loop is an instruction that repeats a group of other instructions. For example, 'repeat 4 times: forward, turn right' draws a square. Loops make programs shorter and easier to read than writing the same steps again and again.

What does debugging mean for kids?

Debugging means finding and fixing mistakes, called bugs, in a program. A good plan is to run the code, find the block where things start to go wrong, fix it, and then test the program again to check it works.

What age is this sequences and loops game for?

The game is designed for children aged 7 to 9 and matches Year 3 and Year 4 computing in England. No reading of long text is needed, because every instruction is spoken aloud and shown as a short caption.

What does the game include and how long does it take?

It has four chapters on sequence, repetition, logical reasoning and debugging, an optional warm-up on algorithms, and an eight-question final challenge. Playing everything takes about 40 minutes, and children can start any chapter from the map.

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