For those who don't keep up with ex-SEGA/Sonic developers, Satoshi Okano (major artist for Sonic during the Saturn era) rediscovered & released a bunch of line-art for his work in the late-90s, such as his other projects, Samba de Amigo, and notably Sonic! While I'd just be great simply having these, each of these have a bunch of hidden goodies in them! So I'm making this thread to point out the things I noticed. https://twitter.com/okanotion/status/1727510951774306557 On the left of the first image, you can just barely make-out "Sonic Adventure" concept art! I've boosted the contrast/brightness on this image to make it easier to view, but this is concept art for the room where Gamma receives the Jet Booster (and it seems the walls are lined with potential concept art for the upgrade). Judging by the dates of other Sonic pieces here, this seems to date back to mid-late '97. According to Okano, the art on the left is the original art that Okano used for the redesign contest, dated here from October 31st, 1997. A slightly-updated version of this art would end up appearing in the redesign contest, fully in color. Many places attribute that to being around April '97, but this confirms that the redesign happened around the end of '97. Speaking of this art, there's actually what I assume to be unseen/unpublished Saturn-era Sonic art of him sitting & giving a thumbs-up! I've never seen this artwork before, and it's mostly covered by that sketch. I tried to clean it up a bit so that It'd be a little bit easier to see, though I'm not an artist, so it doesn't look the best! Hopefully Okano publishes a clean photo of this one! One of the craziest ones here, full line-art for the weird spider-chick found on one of Speed Highway's posters! Here's the original sketch he made of her on the left. According to Okano, he wanted to design characters for the series at first, but started with simply drawing Sonic. He also made the 3D model found on the poster in Speed Highway! Hopefully Okano posts more, he seems to be talking with others on Twitter & answering questions on there at the moment!