Blindfold Games are free accessible games made for iPhones and iPads.
They are all separate apps so you can install only the ones you are interested in.
Some of them push you to pay for more lives or coins. If you love the game, it might be worth buying some but if you would just like a few more goes you can re-install the app and get your allowance of free coins/lives reset.
I find the Blindfold bop gesture game really cool as it turns your phone into a portable bop-it you can use anywhere. Blindfold cryptogram is also really cool.
Some of them are better than others, so download a few and from a go!