I completed the game and didn't get it. And from the achievements page it doesn't look like anybody else has gotten it recently, either

So after I finished the last puzzle I just got black screen that just stays like that and I didn't get the 7AM achievement, is there any way to fix this?

Is this game at all re-playable, or are there just 24 static puzzles?

I always get a Runtime error! - pop up window on first booting screen then it stops. I can't open the game. Anyone an idea what is the problem ?

We need a reset button for the level if we mess up so much that it would just be easier to restart. also windowed mode.