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---
name: design-the-core-loop
description: "Design the second-to-second and session-to-session core loop before features, since retention lives there. Reach for this at the start of design."
---
# Skill: Design the core loop
Features layered on a weak loop don't save it.
## Step 1 — Define the loop
The moment-to-moment action and its reward (§3 #2).
## Step 2 — Add the session loop
What brings the player back this session and next.
## Step 3 — Layer the meta
Progression and meta on top of a proven loop.
## Step 4 — Test for retention
Validate the loop holds attention before scaling.
## Output
A core-loop and session-loop design with the retention hooks and a meta layer.
