Gemaga[a] was a Japanese video game magazine founded in 1984 as Beep and published by SB Creative.

The editor-in-chief, Yoji Kawaguchi pitched a new format to SoftBank: two separate magazines, one which covers games for Sega Mega Drive, and one which is dedicated to the upcoming Super Nintendo Entertainment System.

Kawaguchi decided to keep the original name Beep to emphasize the continuity between the publications.

Kawaguchi decided to drop "Beep" from its name because according to him, it had served its purpose.

The title was changed to its previously informal name Dorimaga (short for "Dreamcast Magazine") and became a multiplatform publication.