黑熊師傅的陶藝坊接到訂單，孩子用 − ＋ 選底面是幾邊形（或圓形），再選「拉直」做出柱體、「捏尖」做出錐體，或「搓圓」做出球。作品可以拖著轉一轉，後面看不到的邊畫成虛線，再數出有幾個頂點、幾條邊、幾個面。第 1 關做角柱、圓柱和球，第 2 關做角錐和圓錐，第 3 關從數量反推形狀（有 12 條邊的角錐是六角錐），也在長方體和角柱上點出所有和亮起來的面平行或垂直的面，要轉一轉、翻過來才找得齊。
適合年級：五年級（約 10～11 歲）。對應 108 課綱（十二年國教）數學單元：五年級「球、柱體和錐體，面和面的平行與垂直」。各版本教科書的單元順序不同，完整對照請看國小數學課綱對照表。免費、無廣告、不用註冊，手機、平板、電腦打開就能玩，題目有注音，也會念出來。
陪玩小提醒：不用背公式，先想「上下各有幾個、側面有幾個」再加起來。六角柱的側面和隔壁的側面不是直角，所以和側面垂直的只有上下兩個底面，可以拿鉛筆盒或積木比比看。
Master Black Bear’s pottery studio has orders to fill. Children pick the base with − ＋ (3 to 8 sides, or a circle), then Pull up for a prism, Pinch for a pyramid or Roll for a sphere. They can drag the piece to turn it, hidden edges are dashed, and they count its vertices, edges and faces. Level 1 makes prisms, cylinders and spheres, level 2 pyramids and cones, and level 3 works back from a count (a pyramid with 12 edges is a hexagonal pyramid) and asks them to tap every face parallel or perpendicular to a glowing face on cuboids and prisms, turning and flipping the piece to find them all.
Suits Grade 5 (about age 10–11) in Taiwan. Taiwan curriculum (12-year basic education) unit: Spheres, prisms, cylinders, cones and pyramids; parallel and perpendicular faces (Grade 5). Free with no ads and no sign-up, in Traditional Chinese with zhuyin and in English, read aloud. See the Taiwan elementary maths curriculum map.