I think you're talking about configuring the card when creating games, right?
If so, the mobile app isn't as flexible as the website in this area, so you can't increase it above 10. What you can do, however, is create the game on the website and set it above 10 there, and then play it on your iPad.
Or if you're doing it often you can create a template on the website with everything configured as you like it, and then create games with that template from your iPad.
Want let me increase reinforcement values past 10: 2014-11-30 00:12:53
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