moving out outdated js docs

olddocs/js/lessons/rectangle-explosion/challenges.md

@@ -0,0 +1,83 @@
+# snowflake fall challenges
+
+These challenges will allow you to make an exploding rectangle. #docs
+
+**Challenge 0**
+
+### @video vimeo/134649147
+
+This [guided tutorial](https://test.microbit.co.uk/td/lessons/rectangle-explosion/tutorial) will help you create a snowflake animation!
+
+```
+basic.forever(() => {
+    basic.showAnimation(`
+. . . . .
+. . # . .
+. # # # .
+. . # . .
+. . . . .
+`, 400)
+})
+```
+
+**Challenge 1**
+
+### @video vimeo/134649148
+
+Let's begin creating our falling effect by adding another snowflake with `show animation` that displays a different snowflake pattern after the first one.
+
+```
+basic.forever(() => {
+    basic.showAnimation(`
+. . . . .
+. . # . .
+. # # # .
+. . # . .
+. . . . .
+`, 400)
+    basic.showAnimation(`
+. . . . . . . # . .
+. . # . . . # . # .
+. # # # . # . . . #
+. . # . . . # . # .
+. . . . . . . # . .
+`, 400) // ***
+})
+```
+
+**Challenge 2**
+
+### @video vimeo/134649149
+
+To finalize our snowflake fall, let's add a different snowflake pattern.
+
+```
+basic.forever(() => {
+    basic.showAnimation(`
+. . . . .
+. . # . .
+. # # # .
+. . # . .
+. . . . .
+`, 400)
+    basic.showAnimation(`
+. . . . . . . # . .
+. . # . . . # . # .
+. # # # . # . . . #
+. . # . . . # . # .
+. . . . . . . # . .
+`, 400)
+    basic.showAnimation(`
+. . . . . . . # . . . # . # .
+. . # . . . # . # . # # . # #
+. # # # . # . . . # . . . . .
+. . # . . . # . # . # # . # #
+. . . . . . . # . . . # . # .
+`, 400) // ***
+})
+```
+
+**Challenge 3**
+
+If you notice, we have three `basic->show animation()` functions. Try to create the snowflake fall effect by just using one `basic->show animation()`.
+