I still wish Dream Land GB ended up being a crossover between multiple Game Boy games like the POTD said it would.
Here's a list of games and levels I'd include:
Super Mario Land: Muda
Pokémon Red and Blue: Battle
Kirby's Dream Land: Castle Lololo
Wario Land: Rice Beach
Mole Mania: Beach
Metroid 2: Surface
Link's Awakening: Wind Fish
Here's a list of games and levels I'd include:
Super Mario Land: Muda
Pokémon Red and Blue: Battle
Kirby's Dream Land: Castle Lololo
Wario Land: Rice Beach
Mole Mania: Beach
Metroid 2: Surface
Link's Awakening: Wind Fish
Still, these are some great picks.