How do I fix a semi transparent line on retina display?

Hi Folks,

First post! First of all I want to thank you for all your usefull forum-discussions, it made me help to make my game sofar.

I'm ready and set to make a retro platform game, but I'm bumping to a small issue. On retina display my sprites are not connecting well, there are small transparent hairlines between images:

I've tried to make the sprite 300 dpi, but it doesn't seem to work. How to fix?

Why you don't make a sprite and fill it with color inside C2, and also you can use one big sprite instead of 9 sprites.

The 9 sprites in a square is just an example. On the right you see it also but because of the dark grey 'wall' on the background it's not quite clear that there are semi transparent lines.

It's quite frustrating, I want to finish my game and start making the levels, but I can't start, first have to fix this..

Try to use these project settings

Well thanks, this worked! Sometimes there still appears a random 'gap' but that it's quite minor.