Trivia
It was named NES Game of the Year in the 1993 GamePro Editors' Choice Awards (Vol. 6, Issue 2)
It was named #150 out of 200 of the "Greatest Games of Their Time" by EGM Issue #200 (Feb. 2006).
The final level of Kirby's Adventure before the last boss is directly based on Kirby's Dream Land for Game Boy. The level is entirely black and white, the four areas are based on the Game Boy game's four levels, and the music is exactly the same as the Kirby's Dream Land Level 1 theme.
Kirby's Adventure was the second largest game (in megabits) to appear on the NES, weighing in at a hefty 6 megabits (768KB). Enix's Dragon Warrior IV takes the cake as the largest game on the NES, with EIGHT megabits (one full megabyte!!) of data!!