What's New in This Update: ・Added Levels 61–80, featuring seventh chords, extended chords, inversions, chord deduction, ear training, and timed comprehensive challenges. ・Comprehensively upgraded Daily and Weekly Missions, adding new objectives such as no-hint chords, arpeggios, cross-mode practice, and effective practice days. ・Added a "Claim All" button to the Mission interface to collect all completed Daily and Weekly mission rewards at once. ・Removed the redundant "Start Practice" button for cumulative missions like win streaks, logins, and effective practice days. ・Expanded the Achievement system to 277 items, adding targets for weakness improvement, reaction speed, root note stability, chord mastery, and cross-mode capabilities. ・Revamped the Achievements page with new categories, completion rates, progress tracking, and "near completion" items, while retaining players' existing unlock records. ・Upgraded Personal Records and Learning Analysis to display 7-day accuracy, improvement rate, median reaction time, frequently missed chords, and root note weaknesses. ・Enabled direct start from Weakness Analysis for a 5-question remedial practice and a 10-question proficiency test on specific chords or root notes. ・Added a recent baseline comparison to the practice summary to help you understand if your practice session showed genuine improvement. ・Improved the "Today's Schedule" completion screen, recommendation flow, and advanced chord generation logic. ・Significantly reduced software latency from pressing note buttons to audio playback, and prevented double-triggering from touch inputs. ・Enhanced stability for background app switching, audio recovery, timed modes, and quick mode switching. ・Strengthened old save data migration, native backup recovery, and corrupted data protection, safely preserving player XP, stars, missions, and achievement progress. ・Improved layout and interaction on narrow screens for missions, achievements, personal records, and various pop-ups. ・Optimized visual recognition of the teal Daily Missions, purple Weekly Missions, and reward claiming buttons. ・Updated the Special Training Report and QR Code layout to make sharing game challenges easier. ・Refined text display for Traditional Chinese, Simplified Chinese, English, Japanese, and Korean. ・Fixed bugs related to the last question reward, mode switching, returning from the background, level statistics, and UI overlapping. ・Improved overall learning experience, data security, and operational stability.