In a retrospective interview with Yuji Naka, it was revealed that the original Sonic Team put together a small, playable technical demo for the show featuring Sonic in an early version of the Green Hill Zone. Now jump through the wall on the right again, but be careful of the other chandelier.The first glimpse of Sonic the Hedgehog in video game form was at the Tokyo Toy Show in June 1990, which also happened to be the first time the game could be played by the general public. Go to the far wall (on the right) and jump to the right to find some goodies. In Marble Zone act 3 you will find three chandeliers with spikes in them. You get to keep the Emeralds and the Continues accumulated so far. When you have all the Emeralds, continue on with the first level. When you get the next Emerald, and have entered the First Zone, press Reset again. Use the Level Select cheat to get to the Special Zone again. When you get the Emerald, and have entered into the First Zone, press Reset. Use the Level Select cheat (see above) to get to the Special Zone. This cheat allows you to start at the First Level with all the Emeralds, and with lots of Continues. While here, press Left to teleport right and Right to teleport to the left. Go to the left side of the wall and wait for the platform to move. On the last level (Scrap Brain), find the ledges that move right then left. Next, grab the 1-Up at the top of the loop-de-loop and die. Collect it along with enough rings to make 100 for a second life. In Green Hill Zone - Act 3, there is a 1-Up at the very bottom of the level. Note: This only works on the first production releases of Sonic. Also, instead of displaying the time elapsed, it displays the number of sprites currently on the screen. Note that sprite selection is different from Zone to Zone. To select a different sprite, press A, and to place it on the screen, press C. To start debugging, press B, then you can select any sprite in that level and put it on the screen. If you see a bunch of hex numbers on the top of the screen, you're in Debug Mode. After pressing Start to begin a game, hold A until you see Sonic.

Sonic 1 title sprite