Okay, regarding that long debate, I'm going with SpiritCrusher. Sunshine Atoll Zone is on a completely different landmass from Eruption Conduit Zone (as the name of the former implies) and there's no evidence that ECZ is even anywhere near the ocean separating the two.
This is not a matter of laziness or lack of creativity; it is a matter of convention. None of the default SRB2 levels do that either. Could you see any of Techno Hill Zone from the start of Deep Sea Zone? Was there even a solitary tower from Castle Eggman Zone that was visible from the beginning of Arid Canyon Zone? And this didn't happen in any of the most renowned addons for SRB2, either; Mystic didn't make the end of Verdant Forest visible from Flame Rift, and of course, if he had tried to show Flame Rift from the beginning of Midnight Freeze, it wouldn't have made any sense at all.
Nor is this an idiosyncrasy of SRB2 itself. Sonic couldn't catch a glimpse of past levels in his SEGA Genesis days either. Can you see any of Labyrinth Zone from Star Light Zone? Or any of Emerald Hill Zone from Chemical Plant Zone?
Look, if you seriously think that this would look nicer, you're more than welcome to open up Tortured Planet in SRB2 Doom Builder and tinker with it a bit yourself. Maybe if you showed me your revised version, I'd actually like it more and use it, crediting you as coauthor. Or better yet, why not make an entirely new pack? We have a considerable paucity of well-made, elaborate addons for SRB2.
And please don't give me any of that "but i cant design levels!!!!!!" stuff. Do you think I was building Tortured Planet the moment I downloaded a copy of SRB2 Doom Builder? Of course not. There's a learning curve, and you have no one to blame but yourself if you are unwilling to bear the full force of the process.
My very first attempt to make a level ended in me being so frustrated I uninstalled the program in disgust. Later I tried again, and built a level that consisted of only one unbelievably cramped room, a tiny death pit, and an exit sector. My third attempt produced these abominable levels:
http://www.mediafire.com/?1ujjjig6wpccary
You'll need SRB2 1.09.4 to actually play them, but if you don't have 1.09.4 and are unable to obtain a copy, you can take my word for it that those levels were absolutely terrible. In fact, you could argue that they were subpar even for a new designer. It took time, patience, and a willingness to accept criticism (something I had to develop over the course of my experiences here) for me to get where I am now. But it is rewarding, and it is possibly the very best part of SRB2.
Whew. What a roundabout and meandering post. But I stand by every word of it.
On a different note, I have taken Inuyasha's advice and specified the start of the Single Player levels.