Super solid puzzle-platformer that holds up really well, even 30 years later. It's a fantastic reinvention of the original Donkey Kong that actually serves as the first entry in the Mario vs Donkey Kong series (before it became about toys). Mario's flips, jumps, leaps and throws are really fun to utilise and the game's level design and world gimmicks never outstay their welcome, making the game feel fresh. I don't know if I would call this game underrated, but I would definitely encourage more people to check it out if they want to play a great Game Boy game.