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To those just getting into SS1 and have rarely played old games like this, other than the outdated graphics and audio, here are some notable differences between SS1 and modern games:

1. There are no mission list, mission markers, mission clues, etc. The logs and emails are all you've got to perform each task. You have to manually look up logs and emails if you forget the mission detail.

2. You can type notes on the in-game map. This somewhat makes up for the lack of mission markers & clues. Modern games hardly use this feature. But it is quite common for older games to allow custom notes.

3. There are almost no side missions. Because of that, you can complete SS1 in 20-25 hours at a leisurely pace despite the fairly large map sizes even by today's standards.

4. SS1 has no "free-look with mouse" when it came out because this was a DOS game and mice were not yet widespread. You could "free-look with keyboard" like many first-person games in that era, but it was cumbersome. NOTE: the enhanced version provides a very good free-look with mouse feature. Caveat: No. 5 below.

5. You must enter and exit free-look mode manually in order to perform actions that are possible in one mode but not the other. This is actually quite common in older games.

6. There is no tutorial, pop-up tips, etc. to familiarize you with the game's controls, which are quite complicated.

7. Separate keys are used to crouch and uncrouch. (You can also jump to uncrouch.)

8. A separate key is used to un-lean yourself if you are leaning.

9. When picking up content in a container, you must pick up items one by one. There is no "pick up all" option.

There may be others but these are some of the biggies.