1. Lets make four variables: running, falsestart, start and end
2. Set variables inside on start block like this:



3.Add three blocks when Pin is pressed



4. Add show number blocks and clear screen block inside pin P0 pressed to make a countdown

5. Add set variable blocks inside pin P0 pressed


6. Add pause block and put inside blocks that make pause lenght random between 1-3 seconds. Later you can change the lenght.

7. Add blocks to make a dot appear in to your screen.



8. Lets add blocks inside pin P1 pressed



9. Lets do the same thing with P2