- Back to: Sonic the Hedgehog 2 (alpha)/Comparisons.
Act 1
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| Alpha
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| Final game
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Metropolis has the same rotating palette-heavy background from the Simon Wai prototype.
When Sonic enters a tube, the background colour does not flash white. Instead brown and green tiles are drawn - possibly waterfall graphics from another stage.
One of the last drops is laid out in such a way that Sonic and Tails can keep falling without touching anything. As this stage loops around vertically and Mega Drive Sonic games do not handle gravity properly, the characters will keep accelerating, inevitably reaching a greater vertical speed than camera. The game will eventually get confused and propel Sonic upwards. Other Sonic games design their levels so this cannot happen, and the final Sonic 2 is no different.
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| Alpha
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| Final game
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Act 2
Lava does not hurt Sonic or Tails.
Nuts will keep travelling upwards if Sonic or Tails keep running, past the top of screws. The final game ensures that all screws are attached to the ceiling so this can't happen.
This prototype experiments with the idea of putting cog wheels in corners. However, the collision doesn't work properly, with Sonic and Tails being propelled into walls rather than crushed.
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| Alpha
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| Final game
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Act 3
After the first spinning mesh, fall down and you will land on a platform, which decends to a corridor with two doors on the right, preventing Sonic and Tails from going left. This is because in this prototype, the platform covers a hole - one Sonic could get stuck down (although in this prototype he'll fall through the floor). The doors respond to both Sonic and Tails though, so if Tails stands in the way, it is possible for Sonic to move to the right, allow the platform to reset to its original position, then move left and get stuck.
The final game fixes this issue by making the hole much more shallow. However the same quirk in the engine can be exploited in the first act of Sonic the Hedgehog 3's Hydrocity Zone to also allow Sonic to gain access to part of the level he shouldn't have access to.
The very last nut can be made to fall off the screw in this prototype. It will land awkwardly, half-wedged in a slope.
There is no boss, just another signpost.
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| Alpha
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| Final game
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References
