Amnesia: The Second Dimension [READY FOR LAUNCH]

[Darkfire]

For locking the levels if the last one is not completed:
If you made a full conversion, I would try some game-global variables (i think that such exist)
So, after completing a level set var to 1. Make a script in the next level that will teleport you to a dark room with "complete previous level(s) to play this one" message if the var= 0.

I've done such things, for example to change weather to rain after a certain level, but the scripts were between levels, not for whole game.

EDIT: I just realised this probably won't work, as CS's are treated as separate games ;(