Unsurprisingly, Rock N' Roll Climber is a rock climbing game. The ESRB description reads: "This is a rock climbing game in which players must climb up various formations within a time limit. Players navigate rocks and walls by grabbing onto divots and edges and positioning themselves to ensure they do not fall off."
Yes, it's very straightforward. And no, no word on when the roll climbing portion comes into play. If this is Vitei's WiiWare game that uses the Wii Balance Board for its control method, we'll be interested to see how that works for rock scaling.
ESRB Game Ratings [ESRB]