that's what I thought too but you can buy it easily in the US market if you look for OTC:NTDOY

Its not doing very well this year. Is that just because of the market downturn?

I'm not an expert but they're still printing money with DSs and Wiis and they've increased their revenue projections this year... so I would guess yes

I think it has more to do with projected revenue growth. The big factor in stock price isn't profit, it's growth. During the past two years Nintendo's profits doubled year over year. As a result their price rocketed to ~$80/share. Now that their growth has started to stabilize, the premium paid for that growth has disappeared.