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The short promotional teaser of Sonic Advance was presented on E3 in 2001,[1] where it was announced that a Sonic game was under development for the Nintendo platform. The teaser showcased a short clip of Sonic running through an early version of the Neo Green Hill Zone.
The Sonic's 10th anniversary logo showcasing the early project name Sonic The Hedgehog Advance which mentions the game is being developed by Dimps.
The logo fading to black.
Sonic in the early version of Neo Green Hill Zone. The background is different and has less detailed clouds.
A wooden fence behind Sonic and small rocks on the opposite side of the road which are not presented in the final game. Bushes in the foreground also do not have red flowers like in the final game.
As Sonic starts running, palmtrees appear in both the foreground and the background. In the final game, the palmtrees are taller and appear only in the background.
As Sonic gives a V sign, the differences are still the same.
Sonic runs off screen.
"Coming soon" screen on a black background.
Early build
Early HUD icons
Early screenshots featured on many different websites and in various magazines share a common element: the early HUD in the upper left corner of the screen showcases a different Ring icon compared to the one in the final game. Following image gallery shows these different HUD sprites without any notable differences:
Gallery
Early debug coordinates
Some screenshots show hexadecimal codes, which may be present in the game's debug coordinates, much like in early main titles for the Sega Genesis. More screenshots with debug coordinates include:
Clouds on Neo Green Hill Zone's background has a different formation and the sea is different. The sign and lightpost seen on the hill are not featured in the final game.
Clouds are still in a different formation.
Casino Paradise Zone
The castle is a lot duller than in the final game, and has a different shape. In the released game it is much more colorful.
The castle is in the center of the screenshot. In the final game, it always remains in the top left.
Egg Rocket Zone
Egg Rocket Zone has some slightly different foreground tiles.
The area is different, having more rounded tubes with less detail, but the background has more detail.
Special Stages
The screenshot on the right presents a different-looking Special Stage, with the tubular tunnel having basic tiles as opposed to the detailed ones used in the final game. All the sprites for the Rings and Bombs are also completely different.