To climb a ladder in "Grand Theft Auto 4," walk up to any ladder and press the correct action button for your console. There are different buttons for each: Y (yellow) for Xbox, triangle (green) for PS3, and F for PC. Move up or down to climb.Continue Reading
Walk up to the ladder, and stand as close as possible to it.
Make sure you are standing directly in front of the ladder, and press the respective console controller's action button.
Use the joystick or keys to move up or down the ladder.