I imagine there's a dedicated color (looks like pink) that should be treated not as a color but as transparency. So, you draw the first one without drawing any pixels that are pink (that is, leaving the background as is), then you draw the second one on top of it in a similar fashion, then the third and so on.
I imagine there's a dedicated color (looks like pink) that should be treated not as a color but as transparency. So, you draw the first one without drawing any pixels that are pink (that is, leaving the background as is), then you draw the second one on top of it in a similar fashion, then the third and so on.