Believe it or not, there is a story. Cue
Wikipedia:
A top scientist decides to utilise a secret formula to develop his very own army of evil mutant warriors, so he can become the ruler of the world. It is up to Dynamite Duke: a man who is armed with a cybernetic arm along with a machine gun to foil his evil plan.
Mission 1: Air Field
The game is similar to Cabal as well as Seibu Kaihatsu's own Empire City: 1931 and Dead Angle. You have a third-person view, where you are at the bottom of the screen with a clear, see-through hole through your body signifying your hit box. There is a cursor you can move around to aim the gun, but as you move the gun, you will also be moving yourself in order to keep from getting hit. If you lose all your health, you are forced to use a continue or else it's game over.
The Control Pad moves and aims. If you hold Down and Left or Down and Right, you can zoom across the screen in a ducking position, allowing you to duck some - but not all - attacks. A shoots the gun. B punches when pressed and throws a grenade when held. When you hold the button down, there is a gray gauge that fills up at the bottom of the screen, and when it's filled up, you can release the button to throw a screen-clearing bomb, assuming you have enough "D" icons in the lower-right corner of the screen. C performs a close range kick.
At the lower-left corner is your score as well as your current health. As you take damage, your boxes will go from yellow to red. To the right of that is your current ammo count as well as the "P" gauge. As mentioned earlier, when you hold the B button down, there is a gray gauge that fills up at the bottom of the screen, and when it's filled up, you can release the button to throw a screen-clearing bomb, assuming you have enough "D" icons in the lower-right corner of the screen. Speaking of which, that's the only thing left to mention, and you start out with five. However, you can shoot things down to earn more. You'll still want to use them sparingly, however.
The enemies will be in gray here. The bullets will be yellow. When you see the bullets, you'll want to move away from them, and you'll want to hold Down when you move left and right to make it easier to avoid some bullets. When it comes to shooting enemies, you'll want to tap the A button rather than hold it down to allow yourself a better chance to move.
Things such as vehicles and steel drums can be shot down, and sometimes, you can find pick-ups, which you can shoot to pick up. The bullet icons will give you ammo. One row of bullets on the icon gives you 50 shots, while two rows will give you 100. A first aid kit will refill three units of health. A "Full Auto" icon will let you shoot infinite machine gun shots without having to hold A for a limited amount of time. The gray vest is a bulletproof vest, and it will protect you from a limited amount of bullets. It will be above the bombs on the lower-right corner and flashing white for as long as you have it, and after you take enough bullets, it will disappear. If you know what you're doing, you can keep the vest on you for quite a while.
There are also red vehicles with what look like air vents moving around. If you shoot them, you can definitely get a power-up from them.
Besides soldiers, there are also turrets than move in and out of the ground, as well as some in the background. Be ready to move fast and shoot just as quickly, especially near the end when you have two yellow turrets at the top of the screen ready to fire. You'll want to take those things out quickly as you face the mid-boss: a big green tank. As for the tank itself, shoot it as it moves, then duck and move from side to side to avoid the gunfire. When it stops firing, start shooting it down again and keep avoiding those bullets. It will eventually flash red, meaning that it is about to be destroyed. Keep firing and avoiding, and you should be able to come through.
After this battle, you'll fight a big, burly man. Avoid his rocket fist and get as much bullets into him as you can from far away before he gets up close. When that happens, you'll have to use your fists and your ability to stick and move. A will work as a quick punch while B will work as a more powerful one, while C is the kick like it always was. You can duck the punches and keep pressing B while ducking to get some shots in, but when he tries to hit you with his robotic arm, you will want to duck and move to get away from him and his arm as he swings it around. When he stops swinging it, be ready to hit him while continuing to duck down. It won't take long to beat this guy and go on to Mission 2.
If you have less than perfect health at the beginning of the mission, you'll be able to refill three squares before going on to the next one. You also start with 500 bullets no matter what.
Mission 2: Occupied Town
There are more enemies to shoot down, and things such as "Don't Walk" signs, mailboxes and parking meters can be shot down for power-ups.
Some of the enemies will throw bombs at you; these will do damage regardless of whether you have a vest on or not.
The chopper will move from side to side and lower itself before shooting at you; shoot at it as it flies around and duck and move to avoid the shots after it lowers.
The boss here is a man with a flamethrower. Avoid the flamethrower when the guy is far away, and when he gets into close quarters, strike him and get away when he rears back. When he points his gun to shoot a flame, duck under it and move in to punch him. If he flashes, you'll have to move quickly to avoid getting hit by the flamethrower (which thankfully doesn't hurt that much). If he ever moves back to the background, avoid the flames and get your shots in.
Mission 3: Woods
The worst of the new enemies that are here - who are now wearing blue - are the men with the brown Kevlar vests. These guys will jump up and throw kunai at you, and they will damage you through the bulletproof vest. Get used to seeing these kinds of soldiers throughout the game from here on out.
If you find a "Life Up" pick-up, get it. This adds one unit to your maximum health.
The gray tank is the same as the one from Mission 1, but it will also shoot grenades at you when it is low on health. While you can shoot them down, you're better off standing in the gaps between where they land.
At the boss, concentrate on shooting down the myriad of planes and tanks that show up until the center of the bridge opens to reveal a yellow rocket launcher. When you see the black holes turn red, be ready to duck and move to avoid the rockets, and return fire to it whenever possible. Avoid the planes and tanks' shots and just concentrate on the rocket launcher on the bridge, and you should be okay.
Mission 4: Tunnel
You can shoot the rocks near the holes down at the beginning of the level for power-ups. Also, the guys who throw the bombs are back. Near the end, the tank boss from Mission 1 comes back.
The boss is the same guy from the end of Mission 1. He's mostly the same as before, but he has a new attack: the ability to produce a lightsaber out of his right hand. Duck and move to avoid the horizontal slash as he strikes, and if he does two in a row, get away from him before hitting him again, as he will swing downwards. That downward swings has to be dodged; you cannot duck under it. As long as you're on the move, he's still pretty easy.
Mission 5: Factory
There is a bulletproof vest in the filing cabinet all the way to the left at the start, so get it immediately before the cabinet gets scrolled off the screen.
This level is pretty nasty. There will be a lot more enemies on the upper level than on the lower one, but you'll need to shoot down all the objects in the way for power-ups...so pick your poison.
The boss here is the flamethrower guy from Mission 2. He fights much like he did in that mission, and he still has that close-range flamethrower attack that is tough to avoid. Just keep ducking as you move, and keep moving past him. He will whiff all his punches, and he will eventually try to fire the gun at you as you bob and weave. Once again, duck down and move in when he points his gun to the side to shoot, then get in your two punches and back off.
Mission 6: Laboratory
The kunai throwers return after being absent for two missions, so be ready to shoot them down. Also, shoot down all the objects you can, as you're going to need the power-ups. There will also be a fair few enemies at the top of the screen; take them down if you can...and watch out for that floor turret.
To destroy the generator at the center of the boss screen, you'll need to use a bomb to destroy the shield (or you can shoot the gray flashing thing at the bottom). You'll also need to shoot down the masked men in the blue coats to get rid of them for a couple of seconds. Thankfully, they will always drop power-ups, and you can use them to get bullets and the occasional full-auto (although it won't surprise me if they drop Life Ups as well). From there, keep the blue guys down when they show up and keep shooting at the generator. This is probably the easiest boss in the game if you know what to do.
Mission 7: Atomic Reactor
It's one last boss battle! I do horrible in the Let's Play, but I do better in the longplay. Here we go...
The first phase is a guy with a machine gun. Avoid his bullets as he quickly runs back and forth, and keep shooting him in the legs. If he stops moving, keep shooting him in the legs to minimize the boss' movement and bullets. He will fall over the barrier, but he will turn into an alien and come back.
Welcome to the second phase, which can be the end of the game for you if you don't know how to do things. Always duck while moving, and keep moving back and forth around him. He will do two strikes when he is across from you. The first is a punch that you can duck. Hit him if you can with the A button. After he swings that punch, get away from him immediately, otherwise he will hit you with a kick you cannot duck under. If he looks to the side, go back to him and start punching; otherwise, he will hit you with that stretching arm and it will hurt. It will take trial and error to get him to look to the side and go for that extending punch.
After you beat the second phase, you'll get a huge alien for the third phase. Avoid the bullets while shooting the boss. When the boss' eye opens, it will shoot fire at you. When you see the fire, duck and move in one direction. When you see the flames follow you, immediately move in the other direction and keep going to avoid being hit. The eye will close, and you'll have your chance to shoot the boss some more until the eye opens again. Repeat until dead, and stay away from the extreme ends of the room to ensure you can dodge the flames.
Once you beat the third phase, the game is over! Enjoy the ending!