Hi guys,
I found this app called Vocab Hero for Android devices and it's really well done, has good vocab SAT/GRE/GMAT words and is actually pretty fun to play. It's basically a multiple choice game with Who Wants to Be a Millionaire-esque lifelines to see how many words you can get correctly in a row. Also has flash card mode and other goodies. Here's the link:
https://play.google.com/store/apps/details?id=com.dangwu.vocabherolite