For ages 8 and up · Plays in your browser

A coding game where you program a rover on Mars

Solve each mission by writing real Python. BOLTZ does exactly what you write — so you learn to think a problem through, step by step.

Get started for free

I want to learnFor myself, or for my child I teachFor a class or a group
  1. The job
  2. Your program
  3. BOLTZ runs it
  4. Done

Mission

Get power out to the lighthouse.

  • Rock blocks the way — the drill cuts through it.
  • Bedrock bounces the bit back — BOLTZ has to go around it.

        

      

      
      

        
Mission complete

        
The lighthouse is lit.

      

    

    

    

      
      
    

  







  

    
Meet BOLTZ, the rover you program

    
He can’t move on his own. Everything he does, you wrote — and when it doesn’t work, he tells you where the bugs are.

  

  

    

    

      
      
      

    

    

  

  

    
    
    
  

  







  

    
His hints are clues, never the answer

    
You learn by fixing it

    
Some missions ask you to write a program, some to debug one. Every one comes down to problem-solving skills.

    
    
      
  1. Run itSee exactly what your program does.
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  2. Read what happenedWhere did he stop? What did he say?
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  3. Change one thingThen run it again — until the lighthouse lights.
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Get BOLTZ to the lighthouse. Try it — the number is yours to change.

    

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What you’ll learn

        
From one line to real programs

        
Fix after fix, the code grows — and so does the thinking behind it.

      

      
    

    
    
      
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Who it’s for

    
Built for beginners, from age 8

    
No coding experience needed. Children start here, and so do adults who have never written a line.

    

      
Same program, either language
        

      

      

      
The code never changes. Only BOLTZ’s words do.

    

  

  

      
From about 8
Missions start at one line and add one idea at a time. Older learners meet the same thinking, just faster.

      
In the browser
On any laptop or Chromebook, with nothing to install. A keyboard makes writing code easier.

      
Real Python
What you type here is Python you could type anywhere. Nothing is made up for the game.

      
English and 中文
Switch any time. BOLTZ speaks your language; Python stays Python.

      
No ads, no strangers
No advertising, no selling anyone’s details, and no chat with people you don’t know.

      
With a teacher, too
Teaching a class or a club? We work with schools and tutors. Talk to us

  







  

    
What it costs

    
Start free. No card.

    
Every account starts with free missions. Explorer, or Family for the whole household, opens every mission when you want more.

    
    
      
  1. FreeTo start, for as long as you like
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  2. ExplorerEvery mission · RM 29.90 a month, or RM 299 a year
    3. 
      
  3. FamilyUp to 4 people · RM 59.90 a month, or RM 599 a year
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    Compare plans 
  

  

    
Questions parents ask

    

      
Does my child need to know any coding?
No — it’s made for beginners. Missions start with a single line and get harder one step at a time, each adding one new idea, so the challenge grows as they do.

      
Their English isn’t strong. Is that a problem?
The whole game is in English and 中文. Python itself uses a handful of English words — move, turn, if — learned by using them, as every programmer does.

      
What happens when the free missions run out?
Nothing is charged. Your progress stays, and Explorer opens the rest whenever you choose.

      
Can we cancel any time?
Yes. Explorer renews until you cancel, and stays open to the end of the period already paid. The free missions stay yours.

      
Is my child’s data safe?
We ask for an email to sign in and little else. No ads, no selling details, no third-party trackers.

      
Can I use it with a class?
Yes — message us about Schools & partners and we’ll work out what fits your group. Or just start one mission and see.

    

  







  
  
BOLTZ is waiting for your first line.

  Get started for free
  
Free to start · No card · Nothing to install