Dive into the thrilling world of Sonic with this exciting flash version! Ultimate Flash Sonic brings back the classic fun of the original Sega game with a fresh twist. Speed through levels, collect rings, and dodge obstacles just like the good old days. It's super fun and incredibly addictive! Use the arrow keys to move and press the spacebar to jump. Want to unlock everything? Just enter the secret password: 595313131313131. Get ready for an unforgettable adventure!