I believe there are three or four games that won't work on NTSC TVs (Vorton and Efe-Cero and probably a couple others) and a handful of demos, but 95% of homebrew stuff that you get a dchomebrew.org will work fine on an NTSC Dreamcast and TV, so that's almost certainly not the problem you're having.
What games have you tried and what exactly is the problem you're having?
...word is bondage...
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