A handheld video game is a video game designed for a handheld device. In the past, this primarily meant handheld game consoles such as Nintendo's Game Boy line. In more recent history, mobile games have become popular in calculators, personal digital assistants (PDA), mobile phones, digital audio players (e.g., MP3), and other similar portable gadgets.In the past decade, handheld video games currently have become a major sector of the video game market.