1-6

1-6 can refer to the following:
 * World 1-6 from various games
 * Level 1-6 from various games
 * Stage 1-6 from Donkey Kong for the Game Boy
 * Ladida Plains 1-6 from Super Princess Peach
 * Area 1-6 from Mario vs. Donkey Kong: Mini-Land Mayhem!

1-6