From Sonic Retro
|First level, Sonic Heroes|
|Level theme: tropical island|
|← Sea Gate | Ocean Palace →|
Seaside Hill is the first level of Sonic Heroes. Traditional beach and chequered hill fare, the stage includes palm trees and sandy shores. What distinguishes it from its predecessors are the sunken alabaster ruins looping through the surf just off the coast; there is even a massive whale-shaped island off in the distance.
The split-story nature of Sonic Heroes means each team has a different motive for fighting their way through this oceanic paradise. Team Sonic is out to stop "Dr. Eggman" from taking over the world after receiving his message during the intro. Team Dark, meanwhile, is also after Eggman, but each for a different reason even within the Team: Shadow to learn about his past, Rouge to get ahold of his treasure, and Omega to take revenge on Eggman for sealing him in the chamber with Shadow.
On a less malicious note, Team Rose blasts through simply because they're following Sonic; Amy for the obvious reason, with Big and Cream & Cheese tagging along due to a newspaper article depicting Sonic running off with Froggy and Cheese's twin, Chocola. Finally, Team Chaotix is being tested by the mysterious voice from the walkie-talkie, tasked to collect hermit crabs to demonstrate their detective prowess.
The normal / extra missions, along with their respective rank requirements, are:
|Team Sonic||60,000||55,000||50,000||45,000||<45,000||Head for the whale island!|
|Team Dark||70,000||65,000||55,000||45,000||<45,000||Get to the whale island!|
|Team Rose||48,000||42,000||35,000||28,000||<28,000||Get to the other side of the sea!|
|Team Chaotix||45,000||40,000||35,000||28,000||<28,000||Find 10 hermit crabs!|
|Team Sonic||50,000||45,000||40,000||32,000||<32,000||Get to the Goal Ring within 5 minutes!|
|Team Dark||7:00||7:30||9:00||11:00||>11:00||Defeat 100 enemies!|
|Team Rose||2:30||3:00||4:00||6:00||>6:00||Collect 200 rings!|
|Team Chaotix||35,000||30,000||25,000||18,000||<18,000||Find all 20 hermit crabs!|
- A snow-covered Seaside Hill made an appearance in Mario & Sonic at the Olympic Winter Games as the Alpine Dream Event. Elements from the next level Ocean Palace, such as the circular rocks, were added to the event.
- The level also inspired a set of racecourses in Sonic & Sega All-Stars Racing and Sonic & All-Stars Racing Transformed: see Seaside Hill (ASR) and Ocean View.
- A remake of the level, mixed with Ocean palace appears in Sonic Generations.
- The level is also featured as the primary setting of Sonic Dash.