Math Challenge is a structured mental-arithmetic trainer for users who treat practice as performance work, not entertainment. Drill structure: • 2 modes — Count (fixed 10 / 20 / 30 questions) and Time (fixed 30 / 60 / 90 seconds) • 3 difficulty tiers — Easy / Medium / Hard, each with its own number range and operand cap • 7 problem types — Add, Subtract, Multiply, Divide, Decimal, Negative, Mixed (default) • 4 unique multiple-choice answers per question, no duplicates, no missing options • Each mode binds an independent default difficulty (Count → Easy, Time → Medium); user-overridable Measurable output: • Live HUD: score, streak, remaining questions or seconds • Final summary: score, accuracy %, personal best (per mode), full mistake review list • Mistakes are kept until the next session for targeted retry Engineering choices that matter: • 100% offline. No outbound network at all. Cold start under 1.5 s on iPhone SE (3rd gen). • English-only UI (CFBundleDevelopmentRegion = en) for clarity in international classrooms. • iPhone-only build, portrait orientation, no privacy-sensitive APIs, no IAP, no ads, no IDFA. • Whole-card tap targets for accessibility, dynamic-type-aware text, VoiceOver-friendly buttons. If you want a no-frills tool that quietly tracks how fast and how accurately you can compute, Math Challenge fits in any morning warm-up, lesson break or commute.
