Here's the poster for Sonic & the Secret Rings on the Wii.
It takes a mostly decorative approach in order to look cool on the wall. It has the metallic logo & borders, with the subtitle (& Secret Rings) written in Japanese. There's also a smaller sub-head there. The bottom features the date of release and 5 screen shots (one possibly with story words in it) so you can anticipate what some of the levels will look like.
Sonic has the titular ring on his finger & the flame stuck to his chest flaring up dramatically over the 'mysterious door' background. Over all, the poster presents a different/interesting view of the game to get people curious to play it.