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This page details one or more prototype versions of Sonic Jam (Sega Saturn).

A Japanese trial inside a European promotion disc. The Sonic Jam demo from the Sega Flash Vol.5 disc features a trial version of the Sonic World minigame and a few zones from Sonic 1 and 2.

The Saturn Vault has every Saturn game released in the US, all verified with Redump or No-Intro for the best quality available.

It's dated April 21, 1997 - two months before Jam's first release.

General Differences

The animated opening starts with the Sega and TrueMotion logos. In the final version, only the Sonic Team logo shows. The game is not localized yet, as almost all the text is in Japanese, including the disclaimer screens.

This screen is displayed when the demo ends. It translates to 'SONIC JAM Release in June! Sonic Jam Price: 4800 yen'.

It appears when any of the following happen:

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• Sonic World's timer runs out.
• The player finishes one of the classic games.
• No input is detected for 30 seconds. (Anywhere aside from Sonic World.)

Once this screen fades out, the game returns to the Sega Flash Vol.5 title screen.

Whether the player is in Sonic World or playing one of the classic games, they're completely unable to pause the game in this version.

Classic Games

Only the game selection menu is present in this version - there are no further menus to select difficulty, read manuals etc. like in the final game. Only Sonic 1 and 2 can be chosen - the other two games, while present in the menu, cannot be selected and are marked with a message 工事中 that translates to 'under construction'. Selecting a game will IMMEDIATELY kick you into its first zone, meaning you can't use cheats or, if playing Sonic 2, play as Sonic or Tails alone.

The versions of Sonic 1 and 2 in this version are fairly limited:

• In Sonic 1, only Green Hill Zone Act 1 & 2 and Marble Zone Act 1 are playable.
• In Sonic 2, only Emerald Hill Zone Act 1 & 2 and Chemical Plant Zone Act 1 are playable.
• Both games are in easy mode.
• Spin Dash is always enabled for Sonic 1.
• Music doesn't loop, and certain tracks such as the speedup theme are missing.
• In the final game, the classic games' music is stored inside .adp files. In this demo, the tracks are stored in .aif.

After finishing either game's available stages, the game goes to the SONIC JAM Release screen.

Sonic World

After selecting SONIC WORLD on the title screen, this shows up. It translates to 'Sonic World Trial Version - This trial version was made specially and differs from the final product.'. A time attack mode of sorts is still in the final game by holding A and Start on the title screen when selecting Sonic World.

The player won't immediately be given control when they enter Sonic World. They must wait for a countdown timer to appear and reach 'GO!' first. Despite this, they can still run around on the spot beforehand. Sonic World gives the player 1 minute to run around and explore the world. When their time is up, the game goes to the SONIC JAM Release screen.

This version of Sonic World is far smaller than the final game's, lacking many of its effects and features:

• The player cannot enter any buildings.
• The water splash sound is different.
• There are no flickies flying around the map.
• Tails doesn't make any flying sounds.
• There are no secret cards scattered around the map.
• The mission button is missing entirely, meaning no missions can be played in this version.
• There are no controls to zoom out the camera, though it can still be rotated left and right.
• The song playing here has louder percussion and saxophone instruments.

Despite Sonic not being able to enter buildings etc, the animations for him doing so are still in the game.

Aside from the world's limited state its layout is mostly the same as the final game's, but there are a few changes around the map. One of the few and easily noticeable changes is the presence of a spring that was changed into a platform for the final game, likely due to issues getting to the raised area with the spring's reduced movement while bouncing.

In the final game, the spring was moved onto a floating platform accessible via the raised area - only needed to gather rings floating above it. A nearby circle of rings in this area was reduced from 8 rings to 7.

A group of rings in front of the character building were changed from a small group in front of the building to two small circles around the nearby statues.

Along the path near the character building, an extra pillar was added and the existing one was moved slightly to the left. A set of two rings on top of a nearby platform were removed.

None of the floating platforms above the map move in this version, so the floating platform chains are much smaller in order for the player to be able to jump across them. These sections are also missing the pillars placed at the start of each chain.

The floating platforms in the chain near the waterfall form a different path to the chain in the final game. Some of the pillars below the platforms in this area were changed, as well as the addition of a line of 3 rings over the river in the final game.

We are proud to present the long-awaited release of Sonic 2 HD Demo 2.0. From the bottom of our hearts, we want to thank you for taking interest in the game, whether you have followed our development from the very beginning or just heard about our project today. We are truly humbled by your support!

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Click the button to download the latest version of Sonic 2 HD.

The recommended system requirements to fully enjoy Sonic 2 HD:

• OS Windows 7 Service Pack 1 64bit
• CPU Intel Core i5 2500
• GeForce GTX 650 1GB
• 4GB RAM
• 400MB of disk space

Please review the system requirements before attempting to install and run the game.

To install Sonic 2 HD:

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1. Click the button above to find the collection of download links.
2. Choose one link to right-click and “Save Link” to begin your download. All links hold the same download file.
3. Once the download is complete, extract the zip file and run S2HD.exe to start Sonic 2 HD.

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Miles “Tails” Prower joins his best friend Sonic the Hedgehog in Demo 2.0. Speed through the world together as a team, or play as either Sonic or Tails and fly solo through West Side Island.

This tropical paradise off the coast of West Side Island finds new life in the hand-drawn graphics and animations of Sonic 2 HD. Run across the grassy hills and underneath scenic waterfalls as you save all the animals trapped inside Badniks across the beachside landscape.

The iconic industrial facility is the newest zone available to play in Sonic 2 HD. Find your way through the various pipes and ducts of the plant as you speed across a vibrant cityscape. You will need to be quick as platforms constantly shift and Badniks appear at every turn. Don’t get caught in the Mega Mack!

This rocky region is full of hiking paths to explore, whether you’re scaling mountaintops by see-saw or plummeting deep into the dark caverns. Use vine ropeways to travel to unreachable places and take in the crisp cool air. Though be warned: The terrain is volatile, and there’s no telling when earthquakes will strike next.

Built from the ground up for Sonic 2 HD, the SonicOrca engine recreates the feel of the original Sonic games and allows for modern features and functionality that were not possible in 1992. Utilizing modern graphics technologies, SonicOrca enables the high resolution visuals and overhauled interfaces seen throughout S2HD.

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The engine is written in C# and uses SDL2/OpenGL for interaction with the operating system and graphics card. The engine also features built-in tools to allow for streamlined development.

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