Endless Sort
Speed increases over time and rewards long, consistent runs.
Classify the eruption
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.
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.
Pumice
Lapilli
Ash
Obsidian
Pumice bunker
Lapilli bunker
Ash bunker
Obsidian bunkerThree play styles
The same core mechanic, different rhythms — plus rotating local goals you can complete at your own pace.
Precision Drill
Clean accuracy with tighter timing windows.
Surge Sprint
Short bursts of faster drops for quick decisions under strain.
Daily Debris
Weekly Surge
Field Guide
Local Records
Achievements
Progress kept on device
Beyond the arena, the app includes a field guide with twelve tephra types, Local Records by mode, and Achievements for streaks, challenges, and guide exploration. 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. All progress — tokens, owned cosmetics, records, challenge history, and achievements — remains stored locally on your device.
