Debug Mode...
	Japanese text?...
	Level Select menu...
	Obtain all Chaos Emeralds...
	Play as Knuckles...
	Play as Tails or Sonic and Tai...
	Various Achievements...

From the level select, play songs 01, 09, 09, 01, 00, 06, 02, and 03 in that order from the Sound Test. After starting a level, tap the GUI in the top-left corner of the screen to activate/deactivate debug mode.

Tap on 'A', 'G', 'E' 'S' in that order, then you will get a chime, and instead of "Sonic team presents" showing up, white background with Japanese/Chinese black text shows instead, perfectly normal.

On the Main Menu, tap "Up," "Down," "Left," and "Right" on the D-Pad; then, tap "New Game" and "Yes".

On the level select screen, play songs 04, 01, 02, and 06 in that order from the Sound Test.

Complete the game with all the chaos emeralds.

Complete the game as Sonic.

Achievement	How to unlock
Beat The Clock (100 points)	Complete the Time Attack mode in less than 45 minutes.
Blast Processing (50 points)	Clear Green Hill Zone Act 1 in under 30 seconds.
Block Buster (100 points)	Break 16 blocks in a row without stopping.
Bombs Away (100 points)	Defeat the boss in Starlight Zone using only the see-saw bombs.
Chaos Connoisseur (100 points)	Collect all the Chaos Emeralds.
Flawless Pursuit (100 points)	Clear the boss in Labyrinth Zone without getting hurt.
Hidden Transporter (100 points)	Collect 50 Rings and take the hidden transporter path in Scrap Brain Act 2.
One For the Road (50 points)	As a parting gift, land a final hit on Dr. Eggman's escaping Egg Mobile.
Ramp Ring Acrobatics (50 points)	Without touching the ground, collect all the Rings in a trapezoid formation in GHZ Act 1.
Ring King (100 points)	Collect 200 Rings.
Secret of Marble Zone (100 points)	Activate and ride the hidden platform in Labyrinth Zone Act 1.
Secret of Marble Zone (50 points)	Travel through a secret room in Marble Zone Act 3.