Celah Rel is a science puzzle game: players become engineers who decide how wide to leave the gaps in rail and steel bridge joints. A scorching day makes steel grow longer, a cold night makes it shrink, and a friendly little train rolls through both to test the result: a gap too narrow makes the rail buckle, a gap too wide pulls the joint apart. Twenty levels across four worlds, from City Station, River Bridge and Snow Mountains to the Scorched Plain, practise the linear expansion formula ΔL = α · L₀ · ΔT with real figures such as steel’s expansion coefficient of about 12×10⁻⁶ per °C. A good fit for school science lessons, science museums and a brand’s educational campaign. Try it right here below, then picture a game like this featuring your brand’s logo, characters and prizes.
Play It Now
Drag the sliders to set the gaps · drag the thermometer to see the gaps at other temperatures · TEST TRAIN (Enter) · left/right arrows adjust · F formula · P pause · M sound
Rotate your phone to landscape for the best experience.
Add to Home Screen from your browser menu for quick access.
Game Info
CategoryPuzzle Game
ThemeScience & Technology
LanguageID · EN
DevicesPhone · Tablet · Laptop
No installPlays right in the browser
Price to playFree to play
Project file priceUS$69
ControlsDrag the sliders to set the gaps · drag the thermometer to see the gaps at other temperatures · TEST TRAIN (Enter) · left/right arrows adjust · F formula · P pause · M sound
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Gameplay
20 levels in 4 themed worlds (day, night, snow, desert) with rising difficulty: several joints, different materials and a laying temperature to choose
Accurate expansion physics: a magnifier with a millimetre ruler, a draggable thermometer, and a train test at the peak and lowest temperatures
Five materials with different expansion coefficients (steel, aluminium, copper, brass, concrete) plus a "Did you know?" card on every level
A formula panel that works out ΔL step by step, three stars per level, original music and sound effects, and an expressive locomotive with a face
Production Quality
Original graphics, characters, music and sound effects created by our team
Plays instantly on phones, tablets and laptops with nothing to install, lightweight and smooth at 60 fps
Touch and keyboard controls, with high scores and progress saved on the device
Available in Indonesian and English
Order One for Your Brand
Swap the locomotive, carriages and backdrops for your mascot, fleet or brand colours, with your logo on the carriages
Ideal for rail operators, steel contractors, science publishers, schools and museums that want science content that is fun to play
Add online leaderboards, coupons or prizes, QR codes for events and visitor data forms
Fast turnaround from concept to launch, including setup on your website or app
Play Celah Rel Online for Free on Phone and Laptop
Celah Rel is a science puzzle game about rail expansion you can play online for free right in your browser, with no download and no app to install. It runs smoothly on Android phones, iPhones, tablets, laptops and PCs, so it is perfect for a quick break at any time. The difficulty rises step by step, welcoming for beginners yet still challenging for experienced players. Celah Rel is developed by PT Cerdas Inovasi Digital, a game development studio in Indonesia, and can be customised for brand promotions, events and education.
Yes. Celah Rel is free to play online in your browser, with no download and no sign-up needed.
Can I play Celah Rel on my phone?
Yes. It runs in the browser on phones, tablets and laptops. On a phone, use the full screen button and rotate to landscape if the game needs more room.
How do I play Celah Rel?
Drag the sliders to set the gaps · drag the thermometer to see the gaps at other temperatures · TEST TRAIN (Enter) · left/right arrows adjust · F formula · P pause · M sound
How many levels does Celah Rel have?
Celah Rel is built in progressive steps, with the difficulty rising as you play. Category: Puzzle Game.
Can I order a version with my own brand?
Yes. We build custom games with your logo, mascot, prizes and leaderboard for events, booths, campaigns and education. Contact us on WhatsApp for a concept and quote.
How do I buy the project file?
The project file of Celah Rel costs US$69. Use the "Buy project file" section on this page to pay online or order via WhatsApp; bundle discounts apply when you buy several games.
Buy the Celah Rel Project Files
Get the full game to learn from, customise for your brand or publish on your own site.
Complete source code (HTML5 Canvas + JavaScript), no libraries or build step needed
All levels, graphics, music and sound effects included, ready to run in any modern browser
A short guide to changing texts, colours and difficulty and putting the game on your own website
Instant download after payment · secure checkout by PayPal · Buy 3+ games together and save up to 30%
Want a game like this for your brand?
We design and build custom games for event activations, booths, campaigns and education, complete with your logo, mascot, prizes and leaderboards. Besides web (HTML5), we can build it in the format you need: Unity, Unreal Engine, Godot, an Android/iOS app, a desktop (Windows/Mac) game, a touchscreen kiosk, WebGL 3D, or AR/VR. Tell us your idea and we will send a concept and quote.
