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The simple reasons are the portals and the possible environments. Having portals allows to put checkpoints in a creative way and in which parcours game are you running through the facility-sections / testing rooms of Aperture Science?
Thanks for your comment anyways, I hope you could still enjoy the map despite the different "solving" mechanics.
I never would have expected that and because so many players liked this map, I'll start working on another map like this very soon. Thanks again to everyone who played, rated and liked this map!!!
The lines make boxes, each box is a visleaf; for each visleaf the compiler calculates lighting and visibility.
One of the compile steps is to calculate what box can see what box. If you have a lot of boxes this takes a long time. So basically you want to keep the number of boxes low; and only make stuff that really blocks line of sight world geometry, so that does actuallly block your lines of sight :)
Here's my blind playthrough with commentary: http://www.youtube.com/watch?v=gz84K1sg254&feature=youtu.be
i also asked Lpfreaky90 to test your map and leave a comment too :)
LuckyRJ
portal is for puzzle like i told you on skype - not for jumping puzzles - next map do a puzzle :)
LuckyRJ