2-9

2-9 can refer to the following:
 * Level 2-9 from Mario & Wario
 * Stage 2-9 from Donkey Kong for the Game Boy
 * Hoo's Wood 2-9 from Super Princess Peach
 * Room 2-9 from Mario vs. Donkey Kong 2: March of the Minis
 * It Came From the Freezer, World 2-9 from Mario + Rabbids Kingdom Battle

2-9