Despite that downside to Unleashed and Colors (not looking up and down) they are far far better and far more playable than any main series Sonic title released between 2005 and 2007...
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To me and those who I play with, we find 06 waaaaay better than anything released after it. I think what destroyed 06 were the bugs and load times had they been absent it would've been worlds better than Colors/Unleashed based on level design alone.
Massive stages, open ended explore to your heart out.
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Unleashed: Just press the boost button and the level will finish it self for you, all you have to do is tap the direction pad or jump once in a while. And to give the illusion of challenge we'll litter the levels with enemies that don't even damage you if you run in to them directly (without boost) but if you run at them with boost they'll die :S.
Colors lacks bugs and is better than Unleashed in every way but it is the most regressed Sonic game of all time as well. With a World Map that pales in comparison to Super Mario World and invisible Walls that would put Naughty Dog's Crash games to shame.
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I rather play Super Mario World: the map is a million times better than Colors. I hounestly thing they used Mario as a bases for Colors.
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I could play PS1 Crash games for my fix of Invisible Walls. The Havoc Physics also appears to be more advanced in this game and it has item boxes
.
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Honestly if the Yuji Naka'sm TGS 05 vision of 06 was fully realized all the games on the list would've been blown out of the water.