3-7

3-7 can refer to the following:
 * World 3-7 from various games
 * Level 3-7 from various games
 * Stage 3-7 from Donkey Kong for the Game Boy
 * Shriek Mansion 3-7 from Super Princess Peach
 * Room 3-7 from the Mario vs. Donkey Kong series
 * Area 3-7 from Mario vs. Donkey Kong: Mini-Land Mayhem!