Mario Party Advance

Alternate title screen:
Unlock all Gaddgets and Mini-Games to turn the title screen gold.

To select your own background, buy a Poster Gaddget with the desired image in Challenge Land. Go to Play Land, choose "Gaddgets", then select that poster. Return to the title screen after playing with it.

Challenge mode game room:
Play a coin mini-game in Shroom City.

Challenge mode Easy Duel Dash:
Play at least three duel mini-games.

Challenge mode Hard Duel Dash:
Play at least seven duel mini-games.

Challenge mode Normal Duel Dash:
Play at least five duel mini-games.

Challenge mode Mini-Game Attack:
Play more than fifteen mini-games.

Challenge mode Bowser Land:
Play all the Koopa Kid mini-games.

Party mode Koopa Kid Battle:
Play all the Koopa Kid mini-games. Note: This requires to game cartridges to play.

Hint: Credits:
To see the credits, earn 2,000 coins in Challenge Land. Then, go to Challenge Land and select the last option, "Trade coins for gadgets". Buy the credits. Go to Play Land, go to "Gadgets", and press L. IT is the option at the bottom-right corner.
Information in this section was contributed by sam.buddy5.

Hint: Easy money:
Unlock Pair 'Em, then go into the game room and play it. Put 99 coins on everything (press A then R to make the bet go to the maximum). If you are good, you should be able to win any of them easily. However, if you win all five things, your multiplier will double and you will win 4,752 coins each time.
Information in this section was contributed by Jesse Gray.

Hint: Easily complete a quest:
Start the game with Peach. Go to the Horror area and then to Mr. I's house. Keep talking and you will complete the quest and get a new gadget. Note: Make sure when he asks if you are Princess Peach to say yes or you will not complete the quest and get the gadget.
Information in this section was contributed by grannyc.

Hint: Special quests:
Certain quests can be completed by specific characters.

Mario/Luigi: Spear Thicket
Princess Peach Toadstool: Mr. I
Yoshi: Loch Dorrie

Hint: Animal Crossing reference:
After unlocking the "Soil Sonar" Gaddget, play with it. Sometimes, when you go deep enough into the ground, two odd statues will be there. On closer inspection, these statues are Gyroids, which are found in Animal Crossing.
Information in this section was contributed by Toystorytamper.

Hint: Watch 'Em lottery game:
If you have unlocked the Watch 'Em lottery game, go to the game room and go play it. Put 99 coins in, and get the first one correct (1 of 10 chance), the second one correct (2 of 10 chance), and the third one correct (3 of 10 chance), then press B and go back and do it more times. Note: Every time you do this, you will get slightly less than 800 coins.
Information in this section was contributed by sam.buddy5.