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If you like "WordFail", we also have two other free games for improving your English: "I Before E" (which focuses on exactly the words you think it would), and "Apostrophes" (example's, examples, or examples')? Both of these are only available on Android at the moment- we will be bringing them to iOS soon!
"I Before E" Google Play link (FREE)
"Apostrophes" Google Play link (FREE)
Oh, and here's the links to WordFail:
"WordFail" Google Play link (FREE)
"WordFail" iOS App Store link (FREE)