Harvey Birdman: Attorney at Law box is written, and is thus ill-suited for its audience. Unless you're shopping for games with a reader, you won't know until you get home that you have to read to play it. Non-readers probably shouldn't be playing T-rated games anyway, but then they don't know what the rating is due to the tragic use of an alphabetic rating scheme. Even our own warnings will go unheeded, because of our disturbing habit of writing the things we put on the website.
According to Wiicast commenters, a bunch of Nintendo games have this warning on them for unspecified legal reasons, but most other Nintendo games aren't text adventures.