Seaside Hill
| Seaside Hill | |
 Mario & Sonic at the Olympic Winter Games (Wii) screenshot of Sonic racing Mario down Seaside Hill in Dream Alpine (Individual) | |
| Franchise | Sonic the Hedgehog |
| Series | Mario & Sonic |
| First appearance | Sonic Heroes (2003, overall) Mario & Sonic at the Olympic Winter Games (Wii) (2009, with Donkey Kong) |
| Latest appearance | Sonic Dash+ (2022, overall) Mario & Sonic at the London 2012 Olympic Games (Wii) (2011, with Donkey Kong) |
Seaside Hill is the first stage within the Sonic the Hedgehog game Sonic Heroes. It has appeared in one game with Donkey Kong, Mario & Sonic at the Olympic Winter Games for the Wii, as the Dream Event location for both the Individual and Team versions of Dream Alpine.
Seaside Hill retains some elements from Sonic Heroes, such as the checkered landscape and shuttle loops. It also derives some elements from the game's second stage, Ocean Palace, such as the large rolling rocks and the inside of the ruins. The Dream Alpine stage is a constant downhill slope covered in snow for the skiing event. At the opening of Dream Alpine, just before the characters are shown, the camera rotates and gives players a view of the starting gate. The snow is shown to be artificial and blown by giant fans. Eggman's robots, such as Egg Pawns and Egg Hammers, patrol the area and wipe out any character who comes in contact with them.
In Mario & Sonic at the London 2012 Olympic Games for the Wii, Seaside Hill's theme is unlockable, while Ocean Palace is instead featured as a setting.
