I noticed that it has all of the original levels, and all of the official add-on ones, too, but I also noticed that something was missing. Sort of. Namely: The exclusive levels from the home-console versions.
For example, there were several Sunsoft-exclusive ones from the SNES and Mega Drive versions of the game, along with the "Present" difficulty setting from the Mega Drive version, and the several exclusive stages from the Master System/Game Gear version (which were scattered throughout the various difficulty levels, originally) which also had exclusive tilesets, too (such as this one and this one, and the three other follow-ups to these two stages). The Master System/Game Gear version also featured the variant level "Sixes Not!", which replaced the "666" level at a time when it was being removed entirely from other ports, due to overreactions to it from some individuals.
This also brings to mind the music. The exclusive stages used exclusive music sometimes (this example is Sunsoft Special, from the Mega Drive version, which uses characters and music from the NES game Hebereke/Ufouria - The Saga) whilst, for example, the Master System version had some exclusive tunes (namely: Scotland the Brave, My Old Man said Follow the Van, and Miniature Overture) which were in the game but weren't always necessarily used in the exclusive levels.
I was just wondering if either of these things might get implemented at some point, really. (I was also wondering why I'm allowed to skip through to any level I want to, instead of being able to use the old passwords, but that's just an aside, and unrelated to this, really. )
Edited by Prometheus, 05 March 2012 - 01:43 PM.