You added your first event, we're sure it won't be the last!

First event

You used a behavior for the first time, things are way simpler with them don't you think?

First behavior

Previewing your game is the first step towards a complete game!

First preview

Amazing, you just exported your first game! It's truly the quickest way to share it.

First web export

Want to improve your game graphics? Select as many effects as you want from our list!

First effect

Was it an unexpected animation, or were you just curious? Anyway, congrats on using the debugger for the first time!

First debug

Extensions will speed up your project, so use as many as you can!

First extension

If 10 people played your game, it has to mean something right?

Insert a coin

Wow! 100 people played your game, that's amazing, congratulations!

Into Space

1000 people played your game, you're on a whole new level. What is your secret?

Millenium Falcon

Can you imagine if 10k people came to visit you? They probably wouldn't all fit in your living room!

It's over 9000!

50k people playing your game must feel really rewarding, all of the time you put in to making it is paying off.

Fits in your house?

100k people had a good time playing your games, isn't it the best feeling in the world? You must have come a long way to achieve that.

Fits in your yard?

{user} got 100,000 plays on all their games

A second game with 10 players? Is it the same genre as the first?

Solid Snake

{user} got 10 plays on two different games

3 games that each had 100 players! Have you found a name for your game studio?

Eevee

{user} got 100 plays on three different games

You put a star for GDevelop on GitHub - thank you!

Open-source love

{user} starred GDevelop's source code on GitHub

Thank you for representing GDevelop in a major event!

Marketer

{user} represented GDevelop in a major event

You follow GDevelop on TikTok - thank you!

TikTok fan

{user} subscribed to GDevelop's account on TikTok

X follower

{user} follows GDevelop's account on "X" (Twitter)

Youtube subscriber

{user} subscribed to GDevelop's YouTube channel

Congrats on finishing the GDevelop Essentials course!

GDevelop Essentials course graduate

{user} completed the GDevelop Essentials course

Congrats on finishing the UI/UX Essentials course!

UI/UX Essentials course graduate

{user} completed the UI/UX Essentials course

🕹️ Think you make rational choices? Think again!

Mostly Rational: Bias by Design is a witty and thought-provoking card game that challenges the way you think, decide, and react. Each scenario reveals how your mind bends reality — sometimes in hilarious ways.

🎯 What You’ll Experience

4 decks packed with real-world scenarios and clever dilemmas

2 free decks to play instantly, and 2 premium ones for the curious minds

Every choice tests your logic, instincts, and hidden biases

Progress through 7 unique badges — from The Curious One to The Rationalist

🧩 Play Through Human Quirks

Make snap decisions in seconds — just like in real life!
Each card presents a story where you decide what happens next.
Your choices reveal how “mostly rational” you really are.

💼 Decks Include

Classic Deck: Everyday biases we all fall for

Business Deck: Office mind games & decision traps

Social Media Deck: Online choices that shape your world

Corporate Deck: Power, pressure & profit — what will you choose?

🧠 Why You’ll Love It

Blends psychology with play — fun and insightful

Perfect for casual thinkers and curious minds

No data tracking — everything stays on your device

Fresh scenarios every session, designed for replayability

💬 Ready to Outsmart Your Own Mind?

Your brain thinks it’s rational.
Let’s prove otherwise — one card at a time.

Play. Reflect. Repeat.
Mostly Rational: Bias by Design.

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Mostly Rational: Bias by Design