Abacus Practice: Mental Math

Made the Settings skin list lighter to render. List thumbnails now use static images of the real abacus; tap a skin to try bead movement in its interactive preview. Non-interactive boards no longer participate in drag recognition. Removed the duplicate keyboard-dismiss button in invoice arithmetic. The control is now beside the answer field. Hiding the keyboard preserves your entered answer. Improved mock exam and generated-practice layouts. The complete abacus and answer controls remain visible with long questions. All problem lines can be read from first to last. Improved compact-screen and large-text layouts. Reduced resource usage during sustained Free Abacus input. Bead images and touch sounds use bounded shared resources. Improved landscape transitions and initial screen stability. Switch between five languages directly in the app settings, without restarting. Your choice is remembered after relaunch. Existing problem conditions and generated questions are preserved; PDFs are created in the selected language. Translated purchase-information errors now clear correctly after the connection recovers. Now available in Japanese, English, Simplified Chinese, Traditional Chinese and Korean. Screens, all 16 introductory lessons, instructions, purchases and restore, practice history and PDFs follow your app language. Change it directly in Settings > App language inside the app; your choice applies immediately. Improved practice layouts and answer checking. Fixed Clear, sign and keyboard controls and landscape clipping. The free abacus now uses a large landscape board and returns to a portrait layout on exit. Improved question generation for repeat sessions and added completion celebrations. Refined the six bead skins, colors and previews before purchase, mock-exam answer review, problem creation, PDF sharing and records.