Try this free version, and see if you enjoy-- I certainly do! (I just upgraded to the paid version, a big 99 cents.)
The vocabulary is at COLLEGE level, and the definitions are too -- very refreshing. I dont know of another app that does anything like this: Others are either too simple, which is not fun if you want to be challenged; or have an unabridged dictionary, which has many "words" that no one ever uses.
Please join if you like to learn words -- so we can challenge each other. The game allows individual and general "challenges" where "coins" are bet on the outcome. This could be very nice if others come aboard and play.
DEVELOPER IS VERY RESPONSIVE, Ive exchanged several emails. I am quite of a quick fix to the "hard-to-read-outside-the-bubble" text -- meanwhile, just take this as an extra feature, for some definitions, youll need to eliminate the wrong answers, to find the correct bubble. Enjoy!
Appleseeding about Vocabulary Bubble FREE