An IOS app works on my iphone but not on my ipad, why?

I have this game (GTA vice city) that i'd rather play on my ipad… It worked fine on my ipho, e but it shows a black screen and crashes within a second. The ipad has free space, its version is new enough, and both devices follow the same account, any help?

Ipad display has a higher resolution than the iphone display, therefore a game made to fit the iphone display will not fit an ipad display. The picture on the ipad screen will either be displayed "small" or not at all

I guess you have other apps running in the background which are using resources required by the game. Double tap the Home button to show all the running apps. Press and hold on one of the app icons until it starts to shake and has a red circle in the top left corner. Tap the circle on all the apps to close them. Try launching the game again.

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