The Legend of Zelda: Four Swords/Controls

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Action GBA DS
Move Neutral dpad Neutral dpad or Neutral cpad
Lift and throw enemies or push and pull objects R button A button
Swing sword B button B button
View map (GBA)/Whistle (3DS) L button X button
Use item you are carrying A button Y button
Open pause menu Start button Start button
Switch between Links (only in single player mode) N/A L button or R button

The Anniversary edition has the map on the bottom screen, so there is no button assigned to view it. The whistle signals you are here in multiplayer mode, but in single player mode the AI Link will jump to you if he is separated from you