While on the ground with any Yoshi, hold the tip of your finger or stylus on the touch screen and slowly move straight up. Don't turn any other direction, just straight up.
In Time Attack mode you can make Yoshi move at almost twice his normal speed by drawing a cloud on the same level as the normal ground. It makes Yoshi run much faster which should give you a better time.
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!
To unlock Purple Yoshi, you must reach at least 20,000 yards in Marathon Mode. The Purple Yoshi runs much faster than any other type of Yoshi.
Access short mini game from the main menu.
Balloon Popping Mini Game - Get the top high score on each single player mode. Then click on the small balloons behind the main menu options.
Challenge Mode - Last for longer than 3000 meters in Endless mode.
Time Attack Mode - Score more than 300 in the Score Attack mode.
You could get more eggs while changing colors. To change your yoshi's color just get more points.
Blue yoshi (Can hold 35 eggs) - Get 100 points in flying level
Yellow yoshi (Can hold 40 eggs) - Get 120 points in flying level
Red yoshi (Can hold 45 eggs) - Get 140 points in flying level
Black yoshi (can hold 50 eggs) - Get 160 points in flying level
Sky blue yoshi (Can hold 25 eggs) - Get 60 points in the flying level
Pink yoshi (Can hold 30 eggs) - Get 80 points in the flying level