what's your favorite Gameboy game that isn't Pokemon or Mario?

I've just rediscovered my childhood Gameboys, I grew up in the 90s and had an original, a color, an advance and an sp. My game collection has whittled down over the year to the usual suspects, Pokemons, Zelda's, Mario's and some other standards. But I want to dive into some games that 7 year old me would have brushed over. So...