It depends on how "OLD
" your iPad is.
The current version of iOS is 11
If your iPad is too old, installing iOS 11 on it will make it crawl, and forget about playing any games on it.
Unless your iPad is relatively recent, I suggest you wait until The Room: Old Sins is made for PC -- or consider buying a new iPad if you have money to burn.
This site may help you figure out how old your iPad ishttps://www.macworld.co.uk/how-to/ipad/how-identify-which-ipad-you-have-3528437/
Once you have the model or year, you can check how well that model works with the current iOS 11.