Sonic Origins revealed a new Little Planet Concept Art that shows a bit more of the concept behind the mysterious cut "R2" (Round 2) stage in Sonic CD (set between Palmtree Panic and Collision Chaos). It has taken many, many years to get even the tiniest fragment of information about what this stage was, but this new artwork seems rather telling and I think justifies a new thread entirely to discuss it. The R2 Section of the Image in Question: Previously Released Concept Art (Confirmed by Taxman to be from R2): Animated Gif from the Toei Animation CD opening (Again, confirmed to be from R2, unknown what time period this scene may have occurred in): Incomplete Boss and Enemy Spritework (Also Confirmed by Taxman to be from R2): None of this is discussing Taxman's later attempt to make Desert Dazzle, which was his own idea entirely based on very old, very incorrect 2000s rumors of R2 being a "Dust Hill" like desert stage. Here we're focusing solely on whatever the real R2 once was. That version of the incomplete stage did make it back into at least one version of the mobile release 'and' is even still intact inside Origins' own data. For those curious: Additionally, though I don't have the tweet translation on hand, it's been confirmed that the JP Little Planet theme was an unused R2 track, though we don't know which time period it was based in (Though it doesn't match the style of past tracks and, so either Present or Good Future) https://twitter.com/Mazin__/status/136837158827851777 My personal speculation... It's been pointed out here in the Origins Thread that the concept art showing R2 being underground may track a bit with the trope of R2 being based on Marble Zone, and I agree with that to an extent. Clearly, a non-water zone ruins theme was intended for the stage itself to at least some degree. However, there also seems to be elements of technology in the underground section. Note the giant fan at the bottom and mysterious machine wall Sonic runs by in the animation on the right. I'm also not seeing any evidence of lava in this version of the stage at any point. Furthermore, one detail I think people are overlooking is that R2 as shown on the little planet Diagram appears to have 2 sections, an above ground, and underground. There appears to be rain-clouds and flowing water on the platforms atop (nicely matching the earlier rainbow concept art) before you go into the underground section below. Perhaps Act 1 was supposed to be above ground where the rainbow waterfalls were (and it was raining during this act), while Act 2 would've been fully underground similar to the underground sections of Marble Zone in Sonic 1 (but with spikes and technology rather than Lava). Feel free to speculate more.