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

What’s new

1. Explore four decks covering everyday decisions, work, social media, and corporate life.
2. Make choices in new real-life scenarios and discover the biases behind them.
3. Track your progress in Profile, including deck activity, rank, journey, achievements, and discovered biases.
4. Visit Insights to see your decision patterns, bias trends, curious thinker level, and overall gameplay insights.
5. Enjoy improved illustrations, navigation, and a richer gameplay experience.