What screen size shpuld I use in construct 2 if I'm making a game for android phone like samsung s4 etc?
Ive been using 1280 x 720 pixels for the screen size
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If your target platform is the Samsung S4, you should use the resolution of that device.
1280 x 720 is a good place to start, but its a good idea to make sure your game will work on a variety of different platforms and devices. Have a look at this: https://www.scirra.com/tutorials/73/sup ... reen-sizes
Thanks so much, very informative