白鷺鷥師傅要做各種形狀的風箏骨架。孩子在 7 × 6 的釘板上拖橡皮筋的角到釘子上：第 1 關拉出和紅線垂直或平行的骨架（後面還要經過指定的釘子）；第 2 關圍出直角、鈍角、銳角三角形和等腰三角形；第 3 關圍出梯形（只有一組對邊平行）、平行四邊形、不是正方形的長方形和菱形、斜斜的正方形，以及有兩個直角的梯形。同一個條件有很多種圍法，孩子可以自己發明形狀；圍錯時遊戲會說出圍成的是什麼形狀，並把互相平行的對邊塗成同一種顏色。
適合年級：四年級（約 9～10 歲）。對應 108 課綱（十二年國教）數學單元：四年級「垂直、平行、三角形和四邊形」。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：在釘板上判斷平行，可以數每條邊「往右幾格、往上幾格」，走法一樣（或剛好相反）的兩條邊就平行。正方形也是長方形、菱形和平行四邊形，可以和孩子聊聊這些形狀的關係。
Master Egret builds kite frames on a 7 × 6 peg board. Children drag the corners of a rubber band from peg to peg: level 1 makes a line perpendicular or parallel to the red line (later through a given peg); level 2 makes right-angled, obtuse, acute and isosceles triangles; level 3 makes a trapezium (exactly one pair of parallel sides), a parallelogram, a rectangle and a rhombus that are not squares, a tilted square and a right trapezium. Many shapes fit each rule, and a wrong shape is named with its parallel sides coloured in pairs.
Suits Grade 4 (about age 9–10) in Taiwan. Taiwan curriculum (12-year basic education) unit: Perpendicular and parallel lines, triangles and quadrilaterals (Grade 4). 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.