Most of the time this algorithm does its job well enough for users not to notice. The idea is to push Sonic the minimum number of pixels (up to a maximum of 32 pixels per frame) required to get him out of that solid tile, so the pushing "force" depends on the X position of both Sonic and the solid tile in question. However, if Sonic atttempts to move left, the collision routine will push Sonic right, and if Sonic moves right, the collision routine will push left. If stuck inside a solid tile with no buttons pressed, the game does nothing. There are a number of points in the game where such a situation can occur, usually by objects pushing Sonic into the scenery. Sonic the Hedgehog (and its Mega Drive sequels) struggles to cope if Sonic is stuck inside a solid tile. Missing Press Start Button text on title screen Neither Sonic 2, Sonic 3 or Sonic & Knuckles saw fit to "fix" it, and the Mega Drive has only a finite number of colours to produce a fade.įades to and from white (used when accessing a Special Stage) also occur in such a way so as to give the fade a colour tint, but pixels fade more uniformly regardless of initial colour.
Given that the character of Sonic is mainly blue, it is not known if this was an intentional design choice (or at least, a bug left in on purpose, similar to the warp zones of Super Mario Bros.). While the sequence is only visible for a fraction of a second, it leads to transitions appearing to have a blue tint, with lighter pixels appearing unnaturally dark and green elements momentarily standing out. When fading from black, blue pixels fade in before reds and greens, which in turn appear before cyans, magentas, yellows and whites (which is reversed when fading to black). Screen fades are not treated in Sonic the Hedgehog as one might originally expect.
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