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docs/lessons/screen-wipe/challenges.md

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+# screen wipe blocks challenges
+
+Coding challenges for screen wipe. 
+
+## Before we get started
+
+Complete the [screen wipe](/microbit/lessons/screen-wipe) activity and your code will look like this:
+
+```blocks
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    . . . . .
+    . . . . .
+    . . . . .
+    `)
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    `)
+input.onButtonPressed(Button.A, () => {
+    basic.clearScreen()
+})
+
+```
+
+**Challenge 1**
+
+Create an event handler for Button B.
+
+```blocks
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    . . . . .
+    . . . . .
+    . . . . .
+    `)
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    `)
+input.onButtonPressed(Button.A, () => {
+    basic.clearScreen()
+})
+input.onButtonPressed(Button.B, () => {
+
+})
+
+```
+
+**Challenge 2**
+
+### @video td/videos/screen-wipe-2
+
+Replay the animation when the "B" button is pressed placing the `show LEDs` block on the canvas.
+
+```blocks
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    . . . . .
+    . . . . .
+    . . . . .
+    `)
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    `)
+input.onButtonPressed(Button.A, () => {
+    basic.clearScreen()
+})
+input.onButtonPressed(Button.B, () => {
+    basic.showLeds(`
+    # # # # #
+    # # # # #
+    . . . . .
+    . . . . .
+    . . . . .
+    `)
+basic.showLeds(`
+    # # # # #
+    # # # # #
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    . . . . .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . . . .
+    # # # # #
+    # # # # #
+    `)
+})
+
+```
+
+
+**Challenge 3**
+
+Show an animation that scrolls back up when you press button "B".
+
+* tap the *run* button to view your final product!