Any% Choose a team of four gunners. As fast as you can, skip to the boss stage. Once on the boss screen, launch 3 of your gunners to the far right of your screen while moving the last one closer to attack the normal enemies on the left. If RNG is in your favor, the boss will not be close to the side of your screen. If the boss is too close to the right of the screen your stickmen will take too much damage to survive the attack on the boss. Slight time can be saved on getting higher damage RNG but it is not the best way to save time, focus on quick movement through the start of the level and making sure your stickmen do not have to run up to anything.