The Spy Dagger is a melee weapon featured in S4 League. Players can obtain training version of this weapon along with the Training Homing Rifle when they begin playing S4 League. It was added for a testing phase in Patch 24, on the 30th of November 2010, for a week with two other weapons: the Air Gun and the Homing Rifle. It was made available in the PEN Shop on the 9th of December with the Air Gun.