Sound Test
The Sound Test mode allows you to listen to all the music and sound effects from the game. To unlock the Sound Test, you must complete the game with all five playable characters (Sonic, Cream, Tails, Knuckles, and Amy). Once unlocked, it will appear as an option on the main menu. This is a great feature for fans of the game's soundtrack and provides a nice reward for full completion.
Time Attack Mode
Time Attack mode is unlocked by completing the game with any character. In this mode, you can replay any act you've already cleared with the goal of achieving the fastest possible time. Your best times are recorded, allowing you to compete against yourself or friends. This mode is perfect for practicing speedrunning techniques and optimizing your routes through each stage. It's a fantastic way to extend the game's replayability and challenge your skills.
Boss Attack Mode
Boss Attack mode is unlocked after completing the game with all five characters. In this mode, you face all of the game's bosses consecutively, one after another, with a limited number of lives. The goal is to defeat all bosses as quickly as possible. This mode is a true test of your boss battle strategies and overall combat proficiency. It's a challenging and rewarding mode for players who have mastered the game's mechanics.