Big-City

Big-City is first world of the game Donkey Kong for the Game Boy. After Donkey Kong gets defeated in World 0, the construction site, he takes Mario's lady friend Pauline and escapes with her to this city. Mario chases them from behind. The city introduces most of the new gameplay elements of the Game Boy game, such as Keys that need to be taken to doors to proceed in the levels, as well as Roads and Ladders that can be freely placed. Big-City features eight stages, two of them are boss fights with Donkey Kong. Mario has to defeat Donkey Kong with barrels in stage 1-8.

Appearance
The City is bustling with activity, showing various pictures of a busy looking city landscape in the background. In the foreground; there are various conveyor belts, girders, trash cans, and power lines for Mario to flip and jump off of. The local wildlife, Bowbow, and Rappy make themselves nothing more than a slight annoyance during Mario's short stay; while Faiachūs, Sparks, Oils, and Trash Cans appear as more difficult obstacles for Mario. After the first encounter with Donkey Kong, in Stage 1-4, Road Blocks and Ladder Blocks show up and allow Mario to create temporary Platforms and Ladders respectively. As with all stages in the game, 3 of Pauline's material possessions are scattered across each, and Mario can collect them to play a bonus game once he completes one and his score finishes tallying.

Items and objects
Big-City introduces the following new items: The following objects and obstacles make their first appearance:
 * Key
 * Trash Can
 * Road
 * Ladder
 * Door
 * Rope
 * Spikes

Enemies
Big-City introduces the following enemies:
 * Bowbows
 * Oils
 * Rappys
 * Sparks
 * Trash Cans
 * Faiachū

Trivia

 * The instruction booklet of Donkey Kong Land states that Big Ape City is Donkey Kong's "favourite stomping ground" and also calls it "Big City" in its description, heavily implying the locations are the same.