SRB2Wii is an unofficial port of the 3D platformer fangame Sonic Robo Blast 2 to the Wii. The PowerPC Linux version of SRB2 runs under a tiny Wii Linux distribution loaded from an image. SRB2Wii is under ongoing development.
As of 24 August, 2009, there are two versions that can be downloaded:
An IOS version for people loading SRB2Wii through IOS/Homebrew Channel.
A mini version for people loading SRB2Wii through BootMii, using mini, an open source replacement for IOS.

SRB2Wii v1.5.0 has been released! (1/1/2010 10:10) Here are the changes:
- SRB2Wii's colours have been fixed. It is now a genuine SRB2 experience again. =)
- Massive speed boost from unlocking the Wii's secondary RAM, large levels like ERZ2 even load and play.
- Partially redesigned innards, the boot process is now completely different to the previous versions although this does not affect functionality at all. Updated to the latest versions of SDL and SDL_mixer for this release, the next stable release will have EVERYTHING updated to the latest usable versions.
- Updated the kernel to MIKEp5, based on Linux kernel 2.6.32. This new release brings mainline kernel support for the Wii's wireless chipset, and preliminary support for the Wii's DVD drive (support for both in SRB2Wii is currently unimplemented though, although they will be at a later date, and will be SRB2Wii/mini only.)
- Many other undocumented but otherwise influential and important updates, fixes and additions.
Sorry about the huge wait for the latest release, I've been working on this and around other things as much as I can to deliver the best SRB2Wii experience. Although this one isn't perfect (the launcher is still incomplete, some functionality is still missing and SRB2 isn't the smoothest to play yet) but I really hope you'll enjoy this release. =) Hopefully this will be a pretty good New Years present for you all. Just make sure to delete the old SRB2Wii version off your SD card if you already have one on there, and move your SRB2 data files to /srb2wii on your SD card.
http://repos.srb2.org/srb2wii/srb2wii-source.tar.bz2