Press the screen to focus your sniper rifle at the enemies. Drag your finger to adjust the aiming reticle for precise shots. Release to take the shot and eliminate the target. Duck behind objects by tapping the cover button to avoid enemy fire. Keep an eye on the timer at the top of the screen to ensure you complete the mission within the 50-second limit. Destroy all enemies before time runs out to progress to the next level. Pay attention to enemy movements to predict their attacks and evade return fire. Hone your shooting skills to increase your accuracy and speed for higher scores.