"What is it? Grammar Pop, from the award-winning Grammar Girl http://www.quickanddirtytips.com/grammar-girl , lets users match words in sentences with 1 of 11 speech parts. The game starts off with the basics (nouns, verbs, and articles) and advances through 14,000 words and 28 levels of difficulty. Higher levels include more advanced concepts, such as gerunds, participles, and infinitives. Users can start at Level 1 or move between levels at will, collecting coin prizes and earning achievements along the way."
Via John Evans