Mostly Rational

Darkcity Atelier

In-app purchases

About this game

🕹️ 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.

What’s new

Welcome to Mostly Rational: Bias by Design — a fun psychology game that helps you discover the hidden biases shaping your everyday decisions.

🧠 Play scenario inspired by real-life choices
🎮 Explore Everyday Decisions & Entrepreneurship decks with free starter cards
🃏 Unlock premium Social Media & Corporate Hustle decks
🏆 Earn badges & track how your thinking evolves

No sign-ups. No ads. Just smart decisions and surprising outcomes.

Think you’re mostly rational?
Play and find out.