Three vintage solitaire games. The second one is very easy and suitable for very young children. To play the two others, you need to add and subtract card values, so they may help you improve your mental calculation skills. The third one succeeds quite often. The first one almost never succeeds, but I find it strangely satisfying.
This is the iPhone version of the Mad Cards app for iPad.
This version has been updated for IOS 9.2
With Family Sharing set up, up to six family members can use this app.