Just for info in case its not mentioned until now:
You can extract every game .exe 2x and will find other stuff (.text, .data, icons, .bmp, another .exe with the same name which is much smaller than the original .exe etc.).
After extreacting 2 times go to folder .rsrc/1033/Bitmap (hypno and painful box game):
105.bmp
QUIT.bmp -> which says : "quit? Your progress is automatically saved at the beginning of each chapter."
I did not find further information with steganalysis & HxD in these 2 images!