This document discusses data-centric design and operation for game businesses. It introduces key concepts like unit economy, acquisition, retention, monetization, and lifetime value. Acquisition focuses on user funnels and viral growth. Retention examines normalization charts and keeping users engaged. Monetization looks at metrics like ARPU and considers why users pay. Lifetime value models total revenue per user over their lifespan using techniques like Poisson distribution and segmentation. The goal is to use data to optimize the user experience and business metrics at each stage of the user journey.