We bought this to help our daughter's reading. She wasn't struggling, but it looked like a fun way of helping her along. If you didn't know (I didn't, but my wife did) sight words are those words which don't have a picture. Its one thing doing "A is for Apple" when there is a nice shiny picture of an apple, but "T is for That" will leave even the most imaginative artist a bit stumped.
So this game gets a load of these words, and turns them into a bingo game. Spin the wheel, read the word, find the word on the bingo card.
As another reviewer said, you may want to add your own words, as the challenge may soon wear a bit thin. However, it succeeds in its limited remit, and will soon have your child reading their becauses and whens with a new confidence.