Developer Chronicle

Dev logs, season recaps, and data posts that document the evolution of the game.

Journal2026-02-16

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.

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.