Hello 
I noticed a very bad looking flickering in my “game”. I put several images together, so that it looks like a house with 4 floors. Each floor has 3 images. The borders are not seamless everytime ( yes I counted every pixel 
). And the edges of straight lines are flickering during movement of the character. Could this be because I am using lots of loops iterating arraylists and so on? I cannot think that this is the problem, because it still runs at 60fps (targeted).
In some positions and with luck the overlays are seamless.
Thanks for help
Kronos