A longplay is a play-through of a video game, created with the intent of completing it as fully as possible, mainly for the purposes of nostalgia, preservation, and possibly as a walkthrough. Also, for people who are unable or unwilling to play a certain game, yet wish to know and experience its story, a longplay can be viewed simply as a long digitally animated movie. Unlike speedruns, there is no time constraint aside from those imposed by bandwidth/filesize concerns.[1] Likewise, a longplay is distinct from a Let's Play, in that there tends to be little to no commentary on the game from the player.
The defining characteristic of a longplay is that few shortcuts, if any, are taken to finish the game. Dull moments may be ultimately edited out of the final video, and sidequests may be ignored, but in general every task necessary to reach the end is to be recorded, including cutscenes. (source: wikipedia)
Note: All games are played in normal mode.