updated lessons

docs/lessons/snowflake-fall/challenges.md

@@ -6,25 +6,59 @@ Coding challenges for snowflake fall.
 
 Complete the [snowflake fall](/microbit/lessons/snowflake-fall/activity) activity and your code will look like this:
 
-![](/static/mb/blocks/lessons/snowflake-fall-1.jpg)
+```blocks
+basic.forever(() => {
+    basic.showLeds(`
+        . . . . .
+        . . # . .
+        . # # # .
+        . . # . .
+        . . . . .
+        `)
+    basic.showLeds(`
+        . . # . .
+        . # . # .
+        # . . . #
+        . # . # .
+        . . # . .
+        `)
+})
+```
 
 ### Challenge 1
 
 ### @video td/videos/snowflake-fall-1
 
-Let's begin creating our falling effect by adding another snowflake with `show LEDs` that displays a different snowflake pattern after the first one. We need 2 frames in the new animation that display both the first and the second snowflake images.
-
-![](/static/mb/blocks/lessons/snowflake-fall-2.jpg)
-
-* Run your program to see the cool animation.
-
-### Challenge 2
-
-### @video td/videos/snowflake-fall-2
-
 To finalize our snowflake fall, let's add a different snowflake pattern.
 
-![](/static/mb/blocks/lessons/snowflake-fall-3.jpg)
+```blocks
+
+basic.forever(() => {
+    basic.showLeds(`
+        . . . . .
+        . . # . .
+        . # # # .
+        . . # . .
+        . . . . .
+        `)
+    basic.showLeds(`
+        . . # . .
+        . # . # .
+        # . . . #
+        . # . # .
+        . . # . .
+        `)
+    basic.showLeds(`
+        . # . # .
+        # # # # #
+        . # . # .
+        # # # # #
+        . # . # .
+        `)
+})
+
+```
+
 
 * Run your program and see if it works.