As Daisuke Amaya prepares to release his acclaimed 2D PC action-adventure game Cave Story on Wii, screenshots of the downloadable WiiWare title have emerged.

Packing new content exclusive to the Wii version, Cave Story and its Metroid-like antics are slated to arrive later this year. No price point has been announced.

Cave Story, a freeware 2D PC action game by Daisuke Amaya, will arrive on Wii as a downloadable WiiWare game, Nintendo has announced.

"This title is an action-adventure game with new, exclusive content and features created only for the WiiWare version," reads the relevant chunk of a Nintendo press release.

Bearing a mild resemblance to Nintendo's Metroid series, Cave Story follows hero Quote as he awakens deep in a cave with no memory of how he got there. The game has garnered worldwide praise as well as ports for Mac OS, Linux, other operating systems, and homebrew ports for the PlayStation Portable and Nintendo DS.

A release date or price--presumably not free, in a break with tradition--for the downloadable game is as yet unknown.