Tephra Sort

Tephra Sort is a portrait arcade game built around one clear task: read each falling fragment of tephra and send it to the correct classifier bunker before it reaches the ground. The pace rises as your run continues, so steady focus matters as much as quick taps. Every session is stored on your device, with no network connection, sign-in, or outside services required. At the center of the game is the sorting arena. Four bunkers represent distinct material families, and each fragment shows visual cues that match entries in the built-in field guide. A correct sort extends your streak and keeps pressure manageable. A miss adds ash pressure, and repeated mistakes can end the run. Between rounds you can review what happened, see how accuracy and streaks shaped your score, and decide whether to try again or switch modes. Three play styles give the same core mechanic different rhythms. Endless Sort Mode increases speed over time and rewards long, consistent runs. Precision Drill Mode emphasizes clean accuracy with tighter timing windows. Surge Sprint Mode pushes short bursts of faster drops so you can practice quick decisions under strain. Daily Debris and Weekly Surge add rotating local goals you can complete at your own pace, with progress and history kept on the device. Beyond the arena, the app includes a field guide with twelve tephra types, each with a detail screen that explains appearance and sorting rules in plain language. Local Records track your best scores by mode, while Achievements mark milestones such as streak length, challenge completion, and guide exploration. A dedicated screen explains how bunkers map to material types, and another summarizes how sort streaks interact with ash pressure so the scoring model stays transparent. Ash Tokens are earned only through play and spent in the Ash Shop on cosmetic trails, fragment accents, and arena themes. There are no real-money purchases, subscriptions, or account systems. Settings let you adjust sound, haptics, and display preferences, and all progress, including tokens, owned cosmetics, records, challenge history, and achievements, remains stored locally on your device.