This distinction is normally lost outside Japan, where both NVLs and ADVs are commonly referred to as "visual novels" by international fans.
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Otome games can be played on your PC, your PS2, your DS, your cellphone, or more.
Most of these games exist in Japan, but there are some available in English as well. The Videos blog covers the dramatic opening sequences from games (usually Japanese). On the Fans page we link to other sites and blogs talking about otome games, so you can find reviews of the games you're interested in.
The market for visual novels outside of East Asia is small, though a number of anime based on visual novels are popular among anime fans in the Western world.