How to delete iphone game apps without losing the game data, progress?

Basically I got an iphone 6 last year and I sold it and deleted all my data and got the 6s and re-downloaded all the games. Games like asphalt 8 saved but other games like flappy bird, crossy road etc didn't savemy progress when I re-downloaded the game. What did i do wrong and how to fix it.

Don't think you can. There's no save button for flappy bird. And in the end, it's just high-scores, and it doesn't take away from the actual gameplay. Not like there's an actual storyline.

That's the price of getting a new phone, I guess.

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