World 2-3 is the third level of World 2 in Super Mario Bros.
World 2-3 is made up of long bridges the player must run and jump across while avoiding an endless array of jumping Cheep Cheeps. If the player is running, the Cheep Cheeps will usually jump up behind the player, though if the player is walking, they will jump from the front and there's a good chance of the player getting hit. The player also needs to jump across some small platforms that are placed in the second half of the stage. In the only ? Block is a power-up. If the player reaches the stone steps at the end, the Cheep Cheeps will stop jumping from below.