游戲王 | YU-GI-OH!
"Yu Gi" which means game and "Oh" means king, together known as the king of game. Yu Gi Oh is a popular manga created by Kazuki Takahashi. The main character, Yugi is a high school student who often lacks of self-confidence and didn't have lots of friends. One day, he found a strange box contain with puzzle piece which known as the "Thousand Year Puzzle" in his grandfather's toy shop. Being told by his grandfather, he know that the puzzle is a game from Egypt, and will give super power to who ever that solve the puzzle. After completing the puzzle, he realised that the puzzle was actually a small pyramid. wearing this strange pyramid around his neck, it will turns him into a very smart and self-confidence person when Yugi battling with his opponents in various games. One of the famous game is a RPG board games by using various monster cards (Dual Monster).

I have seen both the anime and manga version of YU-GI-OH! As usual, the two version have difference between them. Of of the difference are the extra main character in anime version. Some of the minor differences between anime and manga version are in the story background. Anyway, two of them are great.
introduction by Mclelun

Yu-gi-oh! Games Cheats code
Yugioh! Dual Monsters Super Lair card
Platform: GameBoy

Select campaign mode at the title screen.
Then press up, down, B, down, down, up + B, B.