Nintendo DS guitar game

I probably need to get this guitar-based music toy for the Nintendo DS. Press a direction on the DPad to reach different chords, and strum with the stylus. It’s an import only, but it’s not region-locked…

The default chord layout is missing the B and Bm chords. What’s up with that? No way to blues in E by default!

Here’s some videos of it:

• a guy singing along to one
• this shows you the UI
• an explanation of it in English
• a guy doing Guns ‘n’ Roses on it.