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Nintendo 64 Action
Neutral control Move forward or backward, turn left or right
Up c Down c Left c Right c Neutral dpad Strafe left or right, look up or down
A button Cycle to next weapon
Hold A button Use quick menu
A button + Z button Cycle to previous weapon
B button Reload, interact
Hold B button Toggle secondary mode
B button + Z button Use secondary mode once
L button R button Aim
L button R button + Neutral control Move crosshair
L button R button + Up c Down c Stand up or crouch
L button R button + Left c Right c Lean
Z button Fire, use item

Moving diagonally (strafe + forward/backward) is faster than just strafing or going forward and backward. It is often known as speedstrafing, and is vital for unlocking cheats with low clear times.