Guiding a Robot Around a Maze

We give a robot step-by-step directions so it can find its way through a maze without getting stuck.

Reading is good — doing is better. Practice Guiding a Robot Around a Maze as an interactive lesson.

Definition

Guiding a robot around a maze means writing a list of simple commands — like move forward, turn left, or turn right — that tell the robot exactly where to go, one step at a time, so it travels from the start to the finish without hitting any walls.

Remember the rule

Plan before you move! Draw the path with your finger first, then write each step as a command — one square, one command.

Key words

Command: A single instruction you give the robot, like 'move forward 1 step.'
Algorithm: A list of commands in the right order that solves a problem, like getting through a maze.
Sequence: Doing steps in a specific order — first this, then that, then this.
Turn Left: The robot spins to face the direction that is on its left side.
Turn Right: The robot spins to face the direction that is on its right side.
Move Forward: The robot takes one step in the direction it is already facing.
Debug: Finding and fixing a mistake in your list of commands.
Loop: Doing the same command more than once in a row, like 'move forward' three times.

Worked examples

The robot is at START and needs to move 3 squares forward to reach a star. What commands do you write?

→ Move forward, Move forward, Move forward — that is 3 commands, one for each square. · Every square the robot moves needs its own 'move forward' command.

The robot is facing up. There is a wall straight ahead. The path goes to the right. What do you do first?

→ Turn right — now the robot faces the open path, then you write Move forward to go that way. · Always turn before you move; turning does not move the robot to a new square.

You wrote: Move forward, Move forward, Turn left, Move forward. The robot bumped into a wall on step 2. What do you do?

→ Debug it! Look at step 2. The robot needed to turn left before moving, so fix it to: Move forward, Turn left, Move forward, Move forward. · When a robot crashes, go back and check each command one at a time — that is debugging.

The path goes: 2 squares forward, then 1 square to the left, then 2 more squares forward. Write all the commands.

→ Move forward, Move forward, Turn left, Move forward, Move forward — 5 commands total. · Count the squares carefully on each straight section before you write your commands.

A friend says the robot should 'move forward and turn right at the same time.' Is that right?

→ No — a robot follows one command at a time. First Move forward to the corner square, then Turn right, then Move forward again. · Computers and robots do one step at a time, never two things at once.

Common mistakes

Writing 'turn left' when the robot needs to turn right — always check which way the robot is currently facing before deciding which turn to pick.
Forgetting that 'turn left' or 'turn right' does not move the robot to a new square — you still need a 'move forward' after turning.
Skipping a square — counting the path wrong and writing one too few 'move forward' commands so the robot stops too early.
Starting over completely when the robot makes a mistake — instead, find the exact wrong command and fix just that one step.
Confusing the robot's left and right with your own — imagine you are standing inside the robot facing the same way it faces, then decide left or right.

FAQs

What if my robot needs to turn around and go back the way it came?

Turn right twice (or turn left twice) to do a full U-turn so the robot faces the opposite direction, then use move forward commands to go back.

Can I write 'move forward 3' instead of writing move forward three times?

Yes! Many robot programs let you write a number to repeat a command — that is using a loop, and it saves time when you have many squares in a row.

How do I know if I wrote the right commands before I run the robot?

Use your finger to act it out on the maze — trace each command one at a time and see if your finger reaches the finish without hitting a wall.

What does the robot do if it hits a wall?

It stops! That tells you there is a mistake in your commands. Go back, find where the robot went wrong, and debug that step.

Is there always only one right answer for getting through a maze?

No — there can be more than one correct path. As long as the robot reaches the finish without hitting walls, your algorithm works, even if a friend found a different path.

Why do we practice guiding robots through mazes?

It teaches us how to think in clear, careful steps — the same skill real programmers use when they write instructions for computers.

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