Press Trigger twice, Grenade twice, Trigger, Grenade, Trigger at the title screen. A sound will confirm correct code entry. Player scores will appear in the top left and right corners.
In the "Shake it loose!" screen, instead of shaking the gun vertically, shake it horizontally. Be careful not to hit the viewer(s) beside you.
Instead of shaking the gun or aiming it outside the screen, just cover the muzzle with your hand.
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