Hold the square. Waves of hostiles push in from the north and the flanks. Survive as long as you can.
W A S DMoveMouseLookLeft clickFireRight clickAim down sightsRReloadSpaceJumpShiftSprintCtrl / CCrouchGFrag grenadeXCall in killstreakEscPauseLeft stickMoveRight side dragLookFire buttonShoot (hold)Aim, Reload, JumpOn screenFragThrow grenadeKillstreak chipTap to call it in