no there are no naruto games for the gameboy
You can find some Naruto Flash based games from Flash Card Game Battle, Naruto Fever, My Naruto Games, Brother Games, Games List, and some Naruto fan forums can probably give more links on where to find some Naruto Flash games.
there are no sites or demos for naruto games
You can buy cheap new Naruto games off eBay or you can buy used Naruto games from GameStop.
Yes there are online naruto games. Example - AnimeCrusades.com or UzumakiOnline
There are games for the playstation and other game-consoles. There is a Naruto dating sim where you play as Sakura, but it is hentai. There are a lot of flash Naruto games on deviantart.com.
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Refer to the question "What is Naruto?"
naruto ultimate ninja storm
Naruto GamesSo Many Games of naruto to pick out ofAnimeCrusades.comNaruto Arena (mmorpg)Ninja Manager (mmorpg)Link Below(tons of naruto games)
There's no Naruto games on the PSN store