After you've defeated the last boss sit back and enjoy the fantastic ending.

This guy is very tough, a suitable last battle. First of all, you get a choice of four random items (one of which could be health) each time you do this battle (if you die and restart that is) which is pretty handy. The main thing about this boss is that the gems control Golden Silver; GS himself is invincible, and so you should direct any fire toward the gems. I find the best weapon combo involves a homing gun, the key with this boss is avoiding the attacks will still damaging the gems.

Keep shooting the gems until Golden Silver appears and drops down. He doesn't actually do anything for a short while, so you can knock his health. However he will advance at this point, and any attacks will deal a lot of damage. His Golden Blast Nuclear attack are small explosions just away from his position, which can be dodged if you stand between his hand and the explosions, but is pretty tricky to pull off, so just stay away. The Earth Resolver is where he pounds the ground and causes a shockwave, which can be easily leaped; just watch his arm furthest away and if it moves down you know another wave is due. He can also disappear for a second or two, and when he does, quickly get to the side of the screen and wall jump and dive so when he appears you won't get hurt. He'll also charge across the screen very quickly at you, which is near impossible to avoid especially when close. At other times he will just stand still, so concentrate fire on the gems.

Once you manage to knock his health below the 4000ish mark, Golden Silver will take a backseat and the gems will kick in and do various attacks:

Red Gem - It will hover left to right and have a flame whip going in a circle. Basically follow the same direction and walk either side as it goes round. It will turn around at the wall, so just avoid it again. Be sure you give yourself enough room to maneuver.
Yellow Gem - A continuous torrent of projectiles across the screen. Just duck down to dodge it all and then fire at the gem for a few moments to make it revert to the top and to switch with another.
Blue Gem - Hovers above toward your position and when it's over you will fire down a laser. Just move out of the way as it comes to you and it'll miss easily, then fire at the other gyms while you wait for it to stop and chase you again.
Green Gem - Fires homing projectiles. Get as far away as possible and as a projectile comes toward you it would have stopped homing in by the time you jump to avoid it. If you are too close you won't be able to move out of the way in time.

At the start he'll just block any fire you throw at him, so hang from the above ledge and spray at him to injure him. He'll change level and shield again so keep hanging and firing until he changes. He will either stand at the edge and throw stars across the screen or advance toward you. When he throws stars, get to the other layer and wait until he's finished. When he advances toward you, stay away and dive if you need to and retreat to the other layer and fire. He'll just resort between those two methods of attack for the remainder of the battle.

Get some fire in before he flies up and wait for the Gambits to come down. These are spheres that fire a layer of fire in one place, so dodge them as they come down. They will either come down so they create a maze you have to wonder through (if this is the case identify this early on to enter and make your way through, if you get stuck at the side you will get burned) or come down in random fragments, which must be dodged or shot at to destroy. Now Black will do Shadow Hurricane which are three lasers revolving in a clockwise fashion. Use the platforms to the left side to head up and avoid the laser and jump across the boss itself to the other side and drop down underneath, and repeat, firing at the boss all the while. He'll just do this until he's a beaten.

Simply begin a game with each of the four weapons. As soon as the game starts just quit and start again with the next weapon.

The first phase isn't too tricky - the After Burner can be ducked under (you can tell when it's warming up when he stays at the edge of the screen for a second or two and has blue flames) and the rest is just Smash flying around dropping bombs, which are easy enough to avoid as long as you concentrate. Keep firing away until his vitality is gone, when you'll have to face him again in Melee mode, with a bit more life than before.

Like most melee battles, avoid getting near Smash. Keep firing as he advances to hinder his movement, and when you reach the corner wall jump over him and run opposite and repeat. When he jumps he will kick down to the ground with an outstretched foot, so keep your distance, and do not let him grapple and smash you as it knocks off a lot of health. At some point in the fight he will back away to the edge of the screen and whip a gun out; there are two different projectiles, both of which aren't easy to avoid. One is a twin set of fireballs which fluctuate up and down, just try and stand where both are furthest away. The second projectile is a homing fireball, which homes in late, so when it's half away across the screen jump and it will move up and miss as you drop back down again. Soon he'll resume his melee moves again. He takes a while as shooting him makes him flash pretty much every shot, but be persistent and just don't get stung by that grapple!

Roll the dice and move around the board to fight various small bosses before making your way to the end of level boss at the end of the board. Before each attack the boss will throw a dice, showing how many steps he will take. Whatever colour his left foot lands on will indicate what attack will take place. Here are tips to avoid each attack; remember to keep firing when you aren't dodging!

Red Fireball - This will go in a clockwise direction around the screen going from one red panel to the next. The easiest way to avoid this is to stand on one of the ledge extra sides, against the wall, as the fireball will just go past you. Obviously when he is climbing the wall you should go on the ledge that is on the opposite side.
Green Cutter -This is a laser that goes clockwise around each green panel. As each panel is somewhat central, standing in one of the bottom left or right corners will ensure you won't get hit by the laser.
Blue Cracker - Bombs will appear from the blue panels in each corner. Stand somewhere in the centre if you can, or on one of the ledges, to avoid the bombs.
Yellow Laser - Lasers will either travel up or down the screen. As the yellow panels are more or less central, standing in one of the bottom left or right corners will ensure you won't get hit by a laser.

Once you have taken down Black, avoid the first gem he throws as it's a fake and will explode. Shoot him so he gives you the real gem!

A pretty tricky encounter, this. Keep your distance from Orange at all times as he will always try to advance toward you. Fire at him as does so and watch his various actions as a clue to what his action will be. If he holds up his arms and hows his biceps at you (face on) he will Hard Shoulder you, ie. rush toward you quickly. When he does this wait a second and jump toward him to counter this attack. When he holds up his arms and has his back more toward you then he will jump on the rotor of the plane and spin around; he will jump off and land on you in about 2-3 seconds so time it right so you can jump and attack him in the air. His other attack is to just jump at you, which he rarely does, especially if you keep your distance. If you fire at him constantly for a few seconds then he will get injured, flash and change move, so watch out for the change after hurting him.

The Seven Force Boss (Green) in The Underground Mine/Green's Stage. The boss has 7 different forms, on easy mode you fight a random selection of 3 bosses. On medium mode you fight 5 of the 7, so you have a better chance of facing Crab Force on this mode. If you don't get him retry the level. Although on Hard Mode you fight all seven forms of the boss it is more simple playing it on medium difficulty. The image below shows the boss in question:

No lateral movement is required here, you just need to concentrate to realise what side of the screen you need to be on and jump between them at the right time. Look at the pincers to see what it's going to do next. The square blocks will extend outward across the screen, so get on the opposite side and stay there was it passes. The spheres will appear from both pincers, and require you to jump over them, the timing is fairly hard so either concentrate and do it right, or just jump and when you are over it jump again to the other side to avoid landing on one. It's final attack are enemy blasts, which will fire toward the opposite side of the screen so if it comes from the upper pincer, get to the upper side of the screen as it will bounce down.

This boss can be pretty tricky. The Hitman Shot has one of the minions on the arm and fires shoots at you from above. Concentrate on avoiding these first and attempt to get shots in at the machine itself to deal damage. The Iron Knuckle is a spike ball on the end of the arm that swings toward you; keep low and at a distance and you should be safe. The trouble with this boss is that it will slowly advance toward you and when you are cornered you'll have to move around it. While you can slide underneath the legs as it moves but if you get stuck underneath, then you are well open to attack and you cannot evade easily. So wall jump off and through the machine and hopefully you'll get through without loosing too much life.

The boss will mostly walk toward you and then attack, so wait at near the edge of the screen and fire away. When he gets close, jump against the screen edge and wall jump off to get over him. He will only attack you with the Spinning Driver and Dragon Punch when he gets close enough, so as you long as you wall jump over him you'll be fine.

Stand directly underneath the plant and fire upward to injure the bulb. Move to the sides if some of the bombs falling are about to hit you, and take out any Mother Ants that spawn.