🧮 LetAbacus 功能截圖LetAbacus Screenshots

一四珠 soroban：上面一珠當 5、下面四珠各當 1。多點觸控撥珠，有真實「啪噠」聲和觸覺回饋。右上角可切換數字顯示和偷看，手感像真的算盤。A one-and-four-bead soroban — the top bead is worth 5, the four below are 1 each. Multi-touch beads with a real click and haptics; the top corner toggles the number readout or a quick peek.

隨便撥，畫面上方即時顯示這是多少（可到五位數）。底部四顆大鈕就是四種模式：☀️ 自由玩、🎓 課程、⭐ 挑戰、👂 聽算。沒有計時、沒有對錯，先跟算盤交朋友。Slide freely and the number up top updates live (up to five digits). The four big buttons are the four modes — ☀️ free play, 🎓 lessons, ⭐ challenge, 👂 listening. No timer, no right-or-wrong — just make friends with the abacus.

在會寫數字之前，先把「量」玩出來。一眼看量、缺幾個到 5／10、哪一盤比較多、看一眼記珠像——數感島用水果和珠子養直覺。Build a feel for quantity before writing numerals. See-at-a-glance amounts, how many more to 5/10, which tray has more, remember-the-beads — Sense Island grows number intuition with fruit and beads.

家長閘後的進度總覽：課程星星、完成課數、看算＋聽算答對數、每個單元的星星。「今天 5 分鐘」直接告訴你孩子接下來練哪一課。Behind the parental gate: lesson stars, lessons completed, visual + listening totals, and per-unit stars. "Today's 5 minutes" tells you exactly which lesson to do next.

珠子皮膚收集、解鎖計時（延長／立即上鎖），還有自由讚助「請爸爸工程師喝咖啡」。零廣告、不收資料、完全離線；讚助由 Apple 處理，不解鎖任何功能。Bead-skin collection, an unlock timer (extend / lock now), and an optional "buy the dad developer a coffee" tip jar. Zero ads, no data collected, fully offline; the tip is handled by Apple and unlocks nothing.

要先答一題乘法才能進家長區（小孩按不進去）。所有設定、計時與讚助都收在這道閘後面，孩子的畫面永遠只有算盤和練習。Answer a multiplication question to enter the parent zone (little ones can't). Every setting, timer and tip lives behind this gate — the kid's screen stays just abacus and practice.

同一套算盤在 iPad 大畫面上，珠子更大、更好撥，適合放桌上親子一起玩。上方一樣即時報數。The same abacus on iPad's big screen — larger beads that are easier to flick, great for playing together on a table. The live number readout stays up top.

看一個目標數量（這裡是 4 顆草莓），在算盤上撥出一樣多，撥對就灑彩帶。看算的難度會自動跟著課程進度走。See a target amount (here, 4 strawberries) and set the same on the abacus; get it right and confetti flies. Visual-round difficulty tracks your course progress automatically.

「哪一盤比較多？」左邊 1 顆、右邊 5 顆，選多的那一盤。用看得見的東西先建立多與少，再連到算盤上的珠子。"Which tray has more?" One on the left, five on the right — tap the bigger one. Concrete more-vs-less first, then connect it to beads on the abacus.

每題做完給三顆星，星星誠實反映「自己獨立完成」的程度。可以重做一次，或按綠勾勾收下繼續。卡住隨時能回看示範。Each round gives up to three stars — honestly reflecting how independently your child finished. Retry, or tap the green check to keep it and move on. Stuck? The demo is one tap away.

八個單元一覽：認識算盤、直加直減、Tens、五補數 (Friends of 5)、十補數 (Friends of 10)、混合、連加 (Running sums)、挑戰盃。每個單元各自累積看算與聽算的星星。All eight units at a glance: Meet the abacus, Simple add & subtract, Tens, Friends of 5, Friends of 10, Mixed friends, Running sums, Challenge cup — each collecting its own visual and listening stars.