Antarctic Tales Enhanced Edition
Digital manual add-on

How to quickly tell if you are playing the enhanced edition of Antarctic Tales:
Credits will mention it right at the beginning.

Summary of new features vs original edition:
- Game difficulty was rebalanced and fine tuned.
- Speed was capped and it is much easier to manage.*
- No need for frequent action button presses. The penguin will jump automatically when faced with an obstacle.*
- Easier to collect flags as you skate towards them.
- Completing a full lap around Antarctica will show a new special screen.
- Sky will change colors with each stage, showing a day/night cycle and weather.
- Outposts with different colors will show up.
- Trajectory of jumping fish became a little more unpredictable, making for a more interesting challenge.
- Faster screen and background transitions in general. 
- 2 additional songs.
- New cyan flag will make the penguin float (low gravity). Same points awarded as purple flag.
- Tips are now provided before each stage at the map screen.
- 2 new special codes that can be entered at the title screen.

* both those features can be reversed by entering the new code '2021' at the title screen. That will activate "Classic Mode".

New map screen and updated time/distance requirements
The map screen of the Enhanced Edition reflects changes made to time and distance requirements of some stages. Those were made with the objective of rebalancing the game difficulty.
Tips are now included at the bottom of the screen now.

No changes to overlay
The overlay required by the Enhanced Edition is the same as the original one.

New auto-jump functionality
No more sore fingers!
Unless you engage "Classic mode", the penguin will automatically jump any obstacles in front of him. He will have a higher chance of success if you approach obstacles head-on, not coming from the sides. 
Also if possible try to stay away from the left/right limits of puddles and crevasses. Those can be tricky and still cause the penguin to lose his balance depending on which angle he would approach the obstacle.
It is still possible to jump manually by pressing an action button.

New cyan flag
This new flag starts to appear at later stages, and picking it up will make the penguin take longer jumps. The effect will fade in case of a collision, or it may wear off on its own after a while.
250 points are awarded for picking up a cyan flag.

New four-digit codes
As mentioned previously, '2021' is the only new code that can be entered at the title screen. Doing that will enable "Classic mode". 
That mode makes for a more difficult game in which the player has to manually jump by pressing the action button. The top speed is also higher, so caution should be taken not to go too fast.

'1234' will enable "Fast Forward". That means starting at lap 2 for a more challenging game.

Previously undisclosed codes:
'1002' will enable the Trainer Mode. This code is not new, but it was not mentioned on the original manual.
'0000' was not mentioned either, and it serves to remove any other previously entered codes that might still be active.

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