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Articles

Explore learning guides, culture and tournaments, and the developer chronicle.

Learn

Canonical, evergreen guides.

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Foundations2026-01-05

Rock Paper Scissors: Complete Competitive Overview

A complete overview of Rock Paper Scissors as a competitive system, not a playground ritual.

World

Culture, tournaments, and commentary.

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World2026-03-02

JPL Season 4 Recap: New Champion, JPL3 Joins the Pyramid

A look back at Janken Pro League Season 4: Eclipse took JPL1, Myths n Legends won JPL2, six promoted and six relegated—and the league expanded to three tiers with JPL3.

World2026-02-16

JPL Season 3 Recap: Expansion Season Crowns New Champions

A look back at Janken Pro League Season 3: Neon Nova took JPL1, Riven won JPL2, and ten were promoted into an expanded top flight with no demotions.

World2026-01-06

What Is Janken? Meaning and Cultural History

The cultural roots of Janken, from language and ritual to how it became a structured decision system in Japan.

Journal

Dev log, seasons, and data reports.

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Journal2026-01-07

Why We Built a Context-Aware Competitive RPS Engine

Most online RPS simulates independence. We built a system that acknowledges context—experience, streaks, pressure—so repeated play feels like real competition.