Hirokazu Yasuhara who was one of the original designers for Sonic 1 & 2 has recently been discussing a lot of early concept and development work which went into Sonic 1 & Sonic 2.
This includes several sketches of level concept art posted on twitter and more interestingly an entire presentation about early Sonic 1 & 2 development builds, these include details such as how the time travel aspect of Sonic 2 would work including a level map, alternative zone layouts and early concept names for zones.
https://t.co/0qouMvEfv9
My talk starts from 4:50. In Japanese though.. 😛— Hirokazu Yasuhara 🍉 (@Yasuharah) May 30, 2017
The presentation is in Japanese however an English version will also be uploaded at a later date.
We’ll let you know when that happens.
Source: Hirokazu Yasuhara Twitter
Hi dude. Just to let you know, according to TimmiT the video isn’t from the presentation in Poland where Hirokazu showed the Sonic concept skteches. It’s apparently from a different presentation.
We will of course be getting an English version of the presentation he did in Poland soon.