World 4-S

World 4-S or World 4-Secret may refer to:
 * Fight Toadies w/ Toadies, World 4-S in Yoshi's Island: Super Mario Advance 3.
 * Hurry and Throw!, World 4-S in Yoshi's Island DS.
 * See Poochy Run!, World 4-S in Yoshi's New Island.
 * Naval Piranha 2: Now It's Personal!, World 4-S in Yoshi's Woolly World.
 * Clandestine Cave, World 4-S in Mario + Rabbids Kingdom Battle.