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docs/reference/js/lessons/rotation-animation/challenges.md

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+# rotation animation challenges
+
+Coding challenges for the rotation animation tutorial. #docs
+
+## Before we get started
+
+Complete the following guided tutorial:
+
+* [tutorial](/microbit/lessons/rotation-animation/tutorial)
+
+At the end of the tutorial, click `keep editing`. Your code should look like this:
+
+```
+rotating = true
+while (rotating) {
+    basic.showAnimation(`
+# . . . . . . # . . . . . . # . . . . .
+. # . . . . . # . . . . . # . . . . . .
+. . # . . . . # . . . . # . . # # # # #
+. . . # . . . # . . . # . . . . . . . .
+. . . . # . . # . . # . . . . . . . . .
+`, 400)
+    basic.pause(25)
+}
+```
+
+### Challenge 1
+
+Now let's add to this by creating a condition for on button pressed `A` before the while loop.
+
+```
+rotating = true
+input.onButtonPressed("A", () => {
+}) // ***
+while (rotating) {
+    basic.showAnimation(`
+# . . . . . . # . . . . . . # . . . . .
+. # . . . . . # . . . . . # . . . . . .
+. . # . . . . # . . . . # . . # # # # #
+. . . # . . . # . . . # . . . . . . . .
+. . . . # . . # . . # . . . . . . . . .
+`, 400)
+    basic.pause(25)
+}
+```
+
+### Challenge 2
+
+### @video td/videos/rotation-animation-1-and-2
+
+Now that we have the on button pressed condition, let's make the animation stop rotating by setting the rotating global variable to false when button `A` is pressed.
+
+```
+rotating = true
+input.onButtonPressed("A", () => {
+    rotating = false // ***
+}) // ***
+while (rotating) {
+    basic.showAnimation(`
+# . . . . . . # . . . . . . # . . . . .
+. # . . . . . # . . . . . # . . . . . .
+. . # . . . . # . . . . # . . # # # # #
+. . . # . . . # . . . # . . . . . . . .
+. . . . # . . # . . # . . . . . . . . .
+`, 400)
+    basic.pause(25)
+}
+```
+
+* Run the code to see the awesome rotation.
+
+### Challenge 3
+
+Let's also make the image rotate the opposite way when button A is pressed! We can do this with another while loop that is only executed while `not rotating`.
+