- "Here, have some bombs!"
- ― Mouser, Super Mario Advance
Mouser is a boss who appears in World 1-3 in Yume Kōjō: Doki Doki Panic and Super Mario Bros. 2. He throws bombs at the character which the player has to throw back at Mouser. For the first Mouser the player faces, the player has to throw the bombs at him three times. The second time the player faces Mouser, the player has to throw the bombs at him five times.
His original appearance was in Yume Kōjō: Doki Doki Panic, which was only released in Japan for the Family Computer Disk System. Doki Doki Panic's characters were changed to Mario characters in the international releases, and therefore, Mouser was changed into a Mario boss.