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Explore learning guides, culture and tournaments, and the developer chronicle.
Learn
Canonical, evergreen guides.
World
Culture, tournaments, and commentary.
JPL Season 6 Recap: Ghost Circuit Claims the Crown
A look back at Janken Pro League Season 6: the league welcomed a new JPL4 tier; Ghost Circuit won JPL1, Aurora dominated JPL2, six new names reached the top flight, and defending champion 1221 went down with the relegation pack.
JPL Season 5 Recap: 1221 Takes the Crown
A look back at Janken Pro League Season 5: 1221 won JPL1, best newcomer, longest in JPL1, narrow escapes, streaks, and how the win rate compared to previous seasons.
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.
Journal
Dev log, seasons, and data reports.
New Feautres & Updates: League Snapshots, JPL Archive and more
New Janken Pro League features: see your position and movement at a glance, browse the season archive, and carry last season’s momentum and history into the new one.
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.