Seaside Hill
Seaside Hill is the first stage in Sonic Heroes and appears as a beginner track in Sonic & Sega All-Stars Racing, and as a stage in the Dreamcast era of Sonic Generations. The place is very tropical, and takes place on grassy cliff sides and beaches. It seems to be a homage to Green Hill Zone from Sonic the Hedgehog, with the checkered walls and palm trees. The stage after it is Ocean Palace.
Mario & Sonic at the Olympic Winter Games
A snow-covered version of Seaside Hill can be found as the Dream Alpine stage in Mario and Sonic at the Olympic Winter Games. In the opening of this stage right before showing the characters the camera pans around and gives us a view of the starting gate. Giant fans can be seen blowing artificial snow onto the stage so it is safe to assume that it doesn't snow here often.
Sonic & SEGA All-Stars Racing
This place appears as a beginner track in this game and is the only stage available in the demo. It is very simplistic, however, it carries many elements from this stage, such as the ramps and cliffs. It is also widely different, due to the fact that this stage is somewhat combined with Ocean Palace and has some elements from Green Hill Zone, including sunflowers and totem poles, and Labyrinth Zone, including traps and carved stone blocks (strongly resembling the ones from the fourth stage in Sonic the hedgehog (16-bit)). A remixed version of the stage music from Sonic Heroes plays. Chao are bystanders in this track. There are three tracks within the Seaside Hill course: Whale Lagoon, Lost Palace and Ocean Ruin.
Sonic Generations
Seaside Hill was recently revealed to be in Sonic Generations in the Two Sonics Trailer.
Ocean Palace will also be mixed in. Parts of this stage seem reminicent of Wave Ocean, Hydrocity Zone, and Adabat. The water in this stage has been significally more emphasized compared to the original. In the classic version, there is a part of the stage completely underwater.
Rank Requirements (Normal Missions)
| Rank A | Rank B | Rank C | Rank D | Rank E | Mission 1 | |
| 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. |
Rank Requirements (Extra Missions)
| Rank A | Rank B | Rank C | Rank D | Rank E | Mission 2 | |
| 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. (Time minutes.) |
| Team Rose | 2:30 | 3:00 | 4:00 | 6:00 | >6:00 | Collect 200 rings. (Time minutes.) |
| Team Chaotix | 35,000 | 30,000 | 25,000 | 18,000 | <18,000 | Find all 20 Hermit Crabs. |
Music
thumb|left|300px|Seaside Hill
thumb|300px|right|Sea Area
Screenshots
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Trivia
- It is possible to play this entire stage with a speed-type character as the leader.
- This level will be playable in Sonic Generations.