Here's how you can download the Marvel War of Heroes app free for your iPad, iPhone, iPad mini or iPod Touch.
1. Go to the Marvel War of Heroes app preview page in iTunes (or tap the link on your iOS device to install the app directly).
2. Click the View in iTunes button.
3. Click the Free button to download the app.
4. Sync your iPad, iPhone, iPod Touch or iPad mini with iTunes to install the app.
Here's a description and screenshot:
"Marvel War of Heroes is the ONLY official mobile card battle game from the Marvel Universe, featuring Spider-Man, Hulk, Iron Man and many more.
Create the ultimate team of Marvel characters and battle other players around the world. Evolve and enhance your Super Heroes, featuring original artwork by Marvel artists."