In Tamagotchi V3, there are 6 games that you can play, Get, Bump, Flag, Heading, Memory, and Sprint.
Get: The goal of this game is to use the A and C buttons to catch the falling music notes before they fall into the bins. You have to guide your bin around to catch the music notes and avoid the falling poops. If a poop lands in your bin, you lose. If a music note falls into one of the bins, you also lose.
Bump: In this game you go up against another Tamagotchi, and you have to press the "B" button at the right time to push your opponent down and win. When it says "PUSH" on the screen, you press the "B" button to try and fill the bar as far as you can. The more the bar is filled, the higher chance you have of winning.
Flag: The objective of this game is to use the "A" and "C" buttons to raise different flags at the right time. Your Tamagotchi will hold up two flags. The left flag is a black flag and the right flag is a white flag. There will be a symbol above telling you which flag you are supposed to raise up. When the symbol above is a white flag, you will have to raise the white flag by pressing the button where the Tamagotchi is holding the flag. The same is for the black flag. When both flags are shown you will have to raise both flags by pressing both the "A" and the "C" button. Sometimes it will show you a flag that is shorter than normal. Don't press any buttons. Wait for it to show a normal flag.
Heading: In this game you use the "A" and "C" buttons to mave your Tamagotchi around and the "B" button to jump up and hit the bouncing ball. You have to bounce the ball 20 times and then you win the game. Be careful to not let the ball fall to the ground or hit your head, because this will make you lose.
Memory: This game will give you a pattern to repeat by pressing the correct buttons. The left arrow is the "A" button. The up arrow is the "B" button. The left arrow is the "C" button. For example, if it showed a pattern up, left, up, right, you would have to press "A", "B", "A", "C".
Sprint: This game is very simple. All you have to do is keep on pressing one of the buttons (it doesn't matter which one), to beat another Tamagotchi in a race.
In Tamagotchi Version 3, there is something called shop codes. Those are codes you enter at the shop to get special items. You enter them by pressing the "A" button 3 times repeatedly when you go to the screen where the shopkeeper is (before you see what's it the shop).
To get cake, press ABBA ACBA
To get steak, press BCAB ACBC
To get cookoo clock, press CBAC CABC
To get RC car 2, press AABB CACB
To get stuffed animal, press CACA BABC
To get hair gel, press ACBB BACC
To get love potion, press BCBC CABA