1) Choose suitable racing sprites – in this case they must have 2 costumes but they must not be the same image.
Costumes tab > import
2) Click into 'Looks' and click 'Set Size to 40%'
3) Get it moving and changing its costume, all these motions should be on your script.
When Clicked
Forever
Move
Wait
Next Costume
Move
Wait
Next Costume
4) To open a new sprite to race, click on the new sprite icon-->
and choose another animal that is suitable to race (that has 2 pictures of the same animal but not the same image).
Make sure those same scripts are on it as well. 
When Clicked
Forever
Move
Wait
Next Costume
Move
Wait
Next Costume
5) Open a new sprite, then choose whichever sprite you would like to use. You then place the sprite at the bottom. Then you drag all the motions onto the scripts, and double click it to draw a finishing line on the left hand side of the page.
5) Place the two racing sprites on the line to start and then click on the green flag for it to race.
Make whichever one you want to win by putting the 'I
START before the FINISHING LINE
WINNER SAYS 'I
