You shouldn't need any instructions but in case you do... Click the letter that matches the first letter of the picture being shown.
This is a game that can be played by children 3 to 5 years old who are learning to read. They see a picture on the screen and have to click on the letter that represents the first letter of the picture. This game tries to be didactically appropriate: the letters are lower-case since that's what children first learn to work with and no instructions should be required - children can just click around to discover how it works. I've tried to make the game as rich as possible using graphics and audio from online sources licensed under free or Creative Commons licenses. The concept is from a worksheet given to me by a teacher in our preschool at the American School of Las Palmas. I will be using this project to teach High School students how to program in Scratch with the intent of having them create their own games based on other, similar worksheets. This game includes an example of how to implement a timeout (so preschoolers who are just sitting in front of the screen without clicking anything are enticed into clicking). One possible extension of this game would be to end it with a very story using the words presented. You could also easily show how many correct and incorret clicks there are at any given point in the game (or just the ratio) in case that's necessary. I should point out that the last word presented, mouse, is a computer mouse rather than the animal as a sort of inside joke. It should be easy enough to replace with an illustration of a mouse should you be so inclined.