Duel Masters: Sempai Legends

Duel Room:
Successfully complete the game to unlock the "Duel Room" option.

Hint: Special cards:
In a trade shop, save and quit. Select "Continue" and in "Special" you should have different cards.
Information in this section was contributed by susan.

Hint: Rare cards:
When you first start the game and it is at your birthday, someone comes in and steals your rare family heirloom card. You are then sent to find the detective. Turn off the game and do not save. Start the game from the "Continue" option and choose a different type of deck. Go to the trade center and go to "Special". Your former "heirloom" card will be up for battles. Do this with each of the different types of decks.
Information in this section was contributed by Togo1055.

Hint: Recommended deck:
When you choose your deck, choose the Fire Deck. Later in the game you will get Bollshack Dragon.
Information in this section was contributed by HS7575WOLF.

The best deck to use is the Light Civilization deck.
Information in this section was contributed by Eratic500.

Hint: Save in the submarine:
You can only enter the submarine after you have accepted the last plaque. Stand outside the submarine, press Start, highlight "Save" and walk into the submarine. Press Start and notice that "Save" is black, and the pointer is on it. Select "Save" to save your game. As long as you do not move the pointer away from "Save", you can repeat this as many times as desired.
Information in this section was contributed by Linkinparkid2008.

Hint: Trade shops:
Trade shops are useful throughout the game. The best is the special section. It has a lot of rare cards (for example, Metalwing, Skyterror, Bolshack, Dragon, etc.).
Information in this section was contributed by Oybay100.

Hint: Avoid losses:
Every time you lose or win, the game records your wins or losses. Let the game record your wins. Every time you think you are going to lose, turn off the game. Turn it back on, and it should show "Lose: 0". Continue doing this to never get a loss.
Information in this section was contributed by phm_duy.

Glitch: Save when not available:
Walk or run to any tournament. Stand in front of it and save the game. Then, enter the tournament door. Press Start and the arrow will be on save, but it states that you cannot save. However, press A and it will save.
Information in this section was contributed by Micki95.