Tunnel Traversal

By The Code Zone team 30 August 2023 2 min read

We are back in Modders Club again today and we are working on Tunnel Traversal!

I hope you all had a wonderful Bank Holiday! We are back in Modders Club again today and we are working on Tunnel Traversal. In this fun game, the player moves along a side-scrolling track and has to jump over on coming obstacles. The further the player gets without bumping into the obstacles, the higher the score they get! Last week's Guided Hack involved us creating a track on the top of the screen in addition to the previous one on the bottom. We modified the code to ensure the obstacles could spawn on both tracks and we also included a button which meant that the cube could switch between both tracks - neat!

This week's Guided Hack is a fun and simple animation hack, which makes the cube spin when it jumps - giving this game some more fluidity. To do this, we build two functions; one which turns the cube clock wise and one that turns it anti-clockwise, depending on which track it is running along. Both functions manipulate the y-axis to make it so the cube is no longer overlapping with one of the tracks, then whilst it doesn't overlap it continuously rotates by 10 degrees. Once the cube makes contact with one of the tracks again, we set the rotation back to 90 degrees so the cube is now in the correct position. Then the functions get called upon the A-Press button which operates the jump. A really nice bit of code which you can add to a multitude of games

The theme for this week's Gam Jam is Strange Sports - I want to see your craziest and funniest sporty creations! Show me what you got!

What a week in the clubs looks like

Posts like this one are what actually happens in a session, written by the mentors who ran it. A Game Dev Club session is one hour a week, in a group of no more than six, with the same mentor every week, online or at one of our in-person clubs.

That cap is deliberate: it is what makes it possible for a mentor to notice when a child has gone quiet, or has rebuilt the same game four weeks running because they are avoiding something harder.

Children build their own games rather than working through a set course. Levels move down as readily as up, so the work always fits, and staying where you are is a perfectly good outcome. Every mentor is DBS-checked and STEM-certified.

Most children start in Scratch or MakeCode and move to Python and TypeScript when they are ready. Mentors write a note on every child after every session, which is how we know when somebody is ready to move up, and it is why a child who has gone quiet for three weeks does not simply go unnoticed.

More than a third of our members are autistic or have ADHD, based on what parents tell us when they join. Children can keep the camera off, type instead of speaking, take a break without it disrupting anyone, and step away and come back.

In 2025 we received the Autism Inclusion Award from the National Autistic Society, and in 2026 we were ranked second in the UK in Club Hub UK’s Top 100 Children’s Activity Providers.

The blog is in two halves. Guides are the evergreen explainers written by the mentors who teach the clubs, covering the questions parents actually ask: what comes after Scratch, how to support a coding-mad child when you cannot code yourself, and what works for autistic and ADHD children.

Club news is the other half, and it is where posts like this one live: game jams, Minecraft builds and weekly roundups, written up by whoever ran the session. Neither is marketing. If you want to know what an hour actually looks like before you book anything, club news is the more honest read of the two.

The first session is a free taster and we do not ask for card details. Book a free taster session, see what it costs, or read about support for neurodivergent children.

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Tunnel Traversal

What a week in the clubs looks like

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