1-2

1-2 can refer to the following:
 * World 1-2 from various games
 * Level 1-2 from various games
 * Stage 1-2 from Donkey Kong for the Game Boy
 * Classic World 1-2 from Super Mario Advance 4: Super Mario Bros. 3
 * Ladida Plains 1-2 from Super Princess Peach
 * Room 1-2 from the Mario vs. Donkey Kong series
 * Chapter 1-2 from Super Paper Mario
 * Area 1-2 from Mario vs. Donkey Kong: Mini-Land Mayhem!
 * 1-2 Remix (Underground), a sample course in Super Mario Maker
 * 1-2 Remix (Yoshi), another sample course in Super Mario Maker

1-2