Get a high score using only one attempt from the Baby Mario level to the Yoshi level to get an open mouthed Yoshi icon.
Balloon Mini-game
Get the high score in all four levels. Balloons will now appear at the title screen. Pop a balloon to begin the mini-game.
Balloon popping mini-game
The trick to getting the high score in the balloon popping mini-game is to pop two or more of the same color after the other. Doing this could get your score up to 150 points.
Black Yoshi
Score over 160 points in a Baby Mario level.
Blue Yoshi
Score between 60 and 80 points in a Baby Mario level.
Bronze Yoshi
Get over 10,000 meters in Endless mode.
Challenge Mode
Get over 3,000 meters in Endless mode.
Coins in Trees
When Baby Mario is falling, you can poke the big leaves on the trees at the end for a yellow or blue coin. This is helpful if you only need a few more points to get a better Yoshi.
Dark Blue Yosh
Score between 100 and 119 points in a Baby Mario level.
Green Yoshi
Score up to 60 points in a Baby Mario level.
Hear background noise
When you blow into the microphone when Baby Mario falls down in any mode, but before you can draw clouds, it will make the drop noise disappear. You can hear the background noise instead.
Marathon
Draw a giant never ending bridge from the beginning of the ground part to when you switch Yoshi. Then, just draw another bridge. It also helps to draw another bridge above you to not get hit from air monsters.
Pink Yoshi
Score between 80 and 99 points in a Baby Mario level.
Purple Yoshi
Finish Challenge mode with no points to unlock Purple Yoshi.
Red Yoshi
Score between 140 and 159 points in a Baby Mario level.
Tickle Baby Mario
At the very end of the flying level, when Baby Mario is about to fall to the floor he will change from the upper screen to the touch screen. Touch Baby Mario with the stylus and you will tickle him.
Time Attack Mode
Get over 300 points in Score Attack mode.
Toy Room completion marker
Collect all toys; the Toy Room 1 and Toy Room 2 options will be preceded and followed by roses to mark that status.
White Yoshi
When playing in marathon mode, get a Black Yoshi. After that, you will have a random chance of obtaining a White Yoshi on the switch off. White Yoshi gives you unlimited eggs until the next time you pass Baby Mario onto the next Yoshi.
Yellow Yoshi
Score between 120 and 139 points in a Baby Mario level.