thank you @tweettopix - seems like a very trivial thing, in the thread which I'm part of it there is an answer but all trial and error - isn't there an official number ?
The size you want, is the size you use. The 'power of 2' I believe applies for HD/retina. So if an object is 64x32 - then that's the size you use.
Same. Just enough to sit outside the edges. I was testing a game using the iPhone 5 settings and the background was the same size but testing it on a tablet - and everything scaled pretty well - which surprised me!
I am sorry to post here. But I am helpless. Please can you solve my problem too? https://www.buildbox.com/forum/index.php?threads/game-destroyed-please-help.3051/#post-18697