Ok I know this question has probably been asked 457601 times but it 4.30 am in Australia in so tired so please help no matter how much you find me a nuisance

How the heck do I download onto iPad I don’t own a computer and this game was my favourite when I was 8 when my mum had gone to bed and I used to sneak and play it but unfortunately never got to finish it

I would have thought the procedure for downloading onto iPad is the same as downloading it onto desktop or laptop. What exactly is the trouble?