Conclusion

The noticeable changes that hard mode makes are:

The level's orientation is inverted





The ammo of a weapon will be cut in half every time you drop it





Enemies are more alert and twitchy

not

That is all, now get out there and enjoy your slaughter!

See, that wasn't so hard! Now you can experience any creation in a whole different perspective. There are no known bugs to doing this exploit, you can swap between either mode whenever you feel so!Note: Hard mode doesaffect the layout of an editor level, any changes regarding wall or enemy placement are up to the level's creator.Cheers,-TC