In this game your tamagotchi is sitting on the ground, 'watching television'. Above his head you will find a picture of a tamagotchi character. You will see different pictures of tamagotchi characters flash onto the television screen your character is watching. Once you see a picture on the television screen that matches the picture in the upper right corner, press button A or B (it doesn't matter which) as quickly as you can. The object of the game is to match up the characters on the television screen to the ones in the picture above your character's head.
Be careful, though, if you wait too long to long during the game to choose a character, you will lose.