Sonic Retro user SMpai has uploaded a couple of documents from Naoto Ohshima which were used in the development of Sonic The Hedgehog for the Mega Drive/Genesis, which describe the final chase of the game and Robotnik/Eggman’s actions, depending on how many Chaos Emeralds Sonic has in his possession:
In the first of them we can observe not only how both characters go outdoors after the last battle, but also how some constructions and clouds in the background of Scrap Brain/Clock Work Zone appear different from those we saw in the final version.
The vertical line is the limiter («リ ミ ッ タ ー») which, when crossed, stops all control by the player.
On the second page, in the image of the bad ending we see a text «LE’S RETRY» instead of the more coherent «TRY AGAIN». Although only 5 drawn emeralds appear, 6 are mentioned in the left margin.
Also mentioned on the right is a «To be continued» («ト ゥ ビ ー コ ン テ ィ ニ ュ ー») message that they would have considered displaying on the screen.
Let’s go through the full text and see what it says:
First panel
プレイヤーがおいかけるスピード(最高速で)に合わせてボスは逃げていくように説定いおく。
Boss will run away at the speed (at maximum speed) of the player
ボスをプレイヤーがおいかけなけゆばモビルの上でまっています。
Boss will wait to board mobile if player doesn't chase
Second panel
ボスはモビールで逃げよっとほす。プレイヤーはボスをおいかけて。モビールに対当りします。
Boss wants to run away on the mobile. Player hits the boss. Hit the mobile.
(注)ボスより右へソニックが方けないようにしたいです。でえるだけ。
(Note) Want to keep from getting to the right of the boss.
ボスは3回以上ダメージをあたえる説定とほす。
Must hit the boss 3 times or more.
どう云う条件にかかゆらずプレイヤーがリミッターをこえた浄からデモ画面になります。
Regardless the outcome, when the player exceeds the limiter the demo screen will appear.
Third panel
(注) 左図はプレイヤーがボスに対い何もなかった場合のボスの軌道
(Note) The left map shows the boss' trajectory when not hit
First panel
カオスエメラルドを６コもっていない場合
If you don't have 6 chaos emeralds
ボスが笑っている ボスの手には。プレイヤがとゆなかた掻のカオスエメラルドを手にている。
Boss is laughing. He has the Chaos Emeralds in hand, minus the ones collected by the player.
Second panel
カオスエメラルド６コをそろえに場合
When you have 6 chaos emeralds
ボスがおこってやがつている。ボロボロになっている。トウビーコンティニューの文亡を出す。出さない。
Boss is angry. Appears tattered. "To Be Continued" message displayed. Cannot exit.