Fortune Street Cheats

Unlockable Boards
Alefgard: Unlock Special Tour
Special Tour: Beat all the boards in Dragon Quest Tour and Super Mario Tour

Unlockable Characters
Unlock characters in Tour Mode.

Dragonlord: Place 1st or 2nd in the Alefgard board.
Jessica: Place 1st or 2nd in Robinn' Hood Ruins in Tour Mode.
Peach: Place 1st or 2nd in Peach's Castle in Tour Mode.

S Rank CPUs
After beating the Special Tour, the intelligence of CPU characters chosen by the player can be raised to S rank by pressing + on the character select screen. (This has no effect on characters who are already S ranks, of course.)

Fast Method of Completing Single-Player with CPU
First, place at least 3rd in Castle Trodain under Standard Rules in the Dragon Quest Tour. Afterwards, purchase the unlocked "Highly-Strung" personality and the "Zealot" play style. This will give your Mii character a "Dominating" COM intelligence. Now, when you play a board, set yourself to Out to Lunch, and the COM will play for you. The COM will be able to place first in games the majority of the time, and the win will still count. This trick is especially useful for those who just want to unlock all the content for multiplayer as quickly as possible.