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docs/lessons/flashing-heart/challenges.md

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+# flashing heart blocks challenges
+
+Coding challenges for the flashing heart tutorial. 
+
+## Before we get started
+
+Complete the [flashing heart](/microbit/lessons/flashing-heart/activity) activity and your code will look like this:
+
+```blocks
+basic.forever(() => {
+    basic.showLeds(`
+        . # . # .
+        # # # # #
+        # # # # #
+        . # # # .
+        . . # . .
+        `)
+    basic.pause(500)
+    basic.clearScreen()
+    basic.pause(500)
+
+})
+```
+
+
+### Challenge 1
+
+### @video td/videos/flashing-heart-1
+
+Let's plot a different image. Let's display a broken heart!
+
+To do this, you need to add a block between the last line and the end loop. Add a `show LEDs` block and then add a `pause` of 500 milliseconds.
+
+
+```blocks
+basic.forever(() => {
+    basic.showLeds(`
+        . # . # .
+        # # # # #
+        # # # # #
+        . # # # .
+        . . # . .
+        `)
+    basic.pause(500)
+    basic.clearScreen()
+    basic.pause(500)
+    basic.showLeds(`
+        . # . # .
+        # . # # #
+        # . . # #
+        . # # # .
+        . . # . .
+        `)
+    basic.pause(500)
+})
+```
+
+
+* click *run main* to see if the code works as expected.
+
+### Challenge 2
+
+### @video td/videos/flashing-heart-2
+
+Now let's alternate flashing the heart and the broken heart. To do this, we need to add a `clear screen` block and then add a `pause` block of 500 milliseconds under the new code we added in Challenge 1.
+
+
+```blocks
+basic.forever(() => {
+    basic.showLeds(`
+        . # . # .
+        # . # # #
+        # . . # #
+        . # # # .
+        . . # . .
+        `)
+    basic.pause(500)
+    basic.clearScreen()
+    basic.pause(500)
+    basic.showLeds(`
+        . # . # .
+        # . # # #
+        # . . # #
+        . # # # .
+        . . # . .
+        `)
+    basic.pause(500)
+    basic.clearScreen()
+    basic.pause(500)
+})
+
+```
+
+
+* click *run main* to see if the code works as expected.
+
+### Challenge 3
+
+You now have a heart and broken heart flashing! Now plot a new image to alternate in with the heart and broken heart.
+