Bomber Man 64

Battlemode Tips:
There is an easy way to get rid of your rivals in Rock Garden and other playfields.
Hold B and then press A to pick up a bomb.
Then bank one off someones head, and while they are still dizzy pick 'em up and throw 'em off.

Bomberman Parts:
Knight Armor - You already have it when you start.
Drill Arm - This battle mode item can be found on Black 1. It is at the very end of the 5th room on the median. In order to get there you must fall from one of the platforms, onto the median, and bomb jump your way up 2 more medians. The remote is helpful. Blow up the box at the end of the room and the drill arm is yours.
High Tops - In the blue resort. In level 3 under the bridge that has a box under it and a blue guy on bridge.
Dragon Head - As shown in the final credit sequence, create a bomb staircase up to the teleporter in the first section. The teleporter will take you to another small room which contains this costume piece.
Iron Goggles - There are three metal doors one the first level, all of which need red bombs to open. This costume piece is located inside the door which is connected to your starting platform. There is a small ramp right before it, so you'll have bomb jump to enter.
Chicken Head - On the final section of this level, there is a cottage with a snowman on top, which you need to destroy to reach the switch activating the ski lift. Don't blow up the house. Destroy the snow man with little bombs. Then use the small ledge to create a bomb jump to the top of the house. There will be a small platform to the right of the house with one tree (the costume piece). After getting the piece, fall off the platform to the left (towards the moutain).

Samurai Head - Beat the game with 120 gold cards.
Dragon Mail - On the first section, you'll notice a teleporter across a bit of water, which you can't reach at first. Get the detonator, and remove all the blocks in that area. Then put a bomb in the elevator (don't detonate it yet!). Then put two large bombs, one on top of the other, against the wall, as close to the edge of the platform as possible. The easiest way to do this is to face the wall and throw the bombs. Then use the elevator to go up, and line yourself up with those bombs. Then carefully walk off and push in the direction of the teleporter. If all goes well, you should bounce off the bombs and into the teleporter.
Iron Armor - Go the way of the avalanche. At the very top of the second section is a cottage. Blow it up with a big bomb. On the other side is a tree with the costume piece.
Cat Suit - After draining the water, it is in one of the pots near the edge, under a bridge (where it was previously underwater).
Cat Hood - To get the cat hood go to that hole in the building where you can get throw a bomb in to get jems,That is the Entrance! Set up some Bombs that lead from the stairs to this window, you don't need to stack Em. once in the house just steer towards the pot.

Dress - The instructions to get this piece are actually in the credit sequence. On the second section, there is an elevator block which is seemingly unreachable. Complete the section as normal, and activate the first elevator. Going up will take you to a suspended platform with three planks. Walk of the last plank, and you should fall on top of one of the four sections below. Use a couple small bombs to bomb hop from one section to another, until you find the other section. This secret section is rather large, but isn't to difficult. The costume piece is near the gold card.
Rocking Horse - Getting to this costume piece is fairly easy compared to some of the others. At the very end of the level, there will be a platform which you need to make fall by destroying the supporting pillars. Before you do that, fall through the hole it will eventually plug. This costume piece should be in a furnace block real close by. Use the tracks to escape the area.

Shogun Kimono - Beat the game with 120 cards.
Knight Shoes - Given to you at the beginning.
Dragon Spikes - On the last section of this level (with the big tower), on the far wall of the structure, facing away from the teleporter which brought you here, is a secret entrance. It looks like a wall, but you can walk through it. You can find it by pulling the camera in as close as possible, and standing next to the wall. Rotate the camera until it is inside the building. There will be two pots in there, one of which is the Dragon Spikes.
Iron Sneakers - Go through the right door once you start. When sliding down the slide, it is in a tree to the far left (opposite side than the switch).

Cat Paws - There is only one metal door on this level, and the cat shoes are behind it. The red bomb is actually in the barrel which is close to the door, but don't blow up the barrel which you need to walk there by accident. If you do, just leave the area and come back. 19.High Tops - Blue 3 - On Cliff, after first dam (get it beforehand).
Bunny Socks - In the second section, there is a [::] switch. On a wall right next to it are a couple blocks. One of them wil have the costume piece.

High Heels - Beat the game with 120 gold cards.
Knight Sword - Given to you at the beginning.
Dragon Gloves - After receiving the Red Bombs, head towards the second section, and enter the teleporter on the left (which is obscured behind a wall). You will need the Red Bomb to blow up the blue pillars. After going through the teleporter, this costume piece will be easy to find in that room.
Iron Nuckles - This one is easy. It is in the same room as the switch which opens the exit.
Slash Claws - Knock down the planks to go the alternative way. Near the exit, you will find yourself right above a single block on a short railroad track. kick a bomb off your higher ground, but use the R-button to stop it as soon as it leaves the platform. It should land right on top of the piece. After the explosion, drop down and get the piece. Use the broken tracks to fall down to the bottom level
.
Chicken Wings - Once first starting, head through the white door. This costume piece will be easy to find, but the strange view might make it seem harder than it is. The costume piece will be out on a ledge in that section, and somewhat hard to navigate to.
Fan - Beat the game with 120 gold cards.
Pony Tails and Duck Feet - You can find these custom parts in Rainbow Palace in Stage 3. In the main room, in the wall closest to the small stair case in the ground, there is an opening in the wall. You go through the wall and use a bunch of bombs to work your way through the platforms in the sky until you reach a large platform with two blocks that can be blown up. After they are blown up, the Pony Tails and Duck Feet are yours.
Sunglasses - he sunglasses are hidden on Black Level 5-3. To get them is not easy. First you must hit the panel on the floor that has 2 dots on them. You then go across and hit the panel on the floor that has 4 dots on them. Proceed back and then hit the panel with 3 dots on it. Now here comes that hard part. If you are facing straight(right after you get off the elevator) go and take the path that appears when you hit the panel with 3 dots. Go up the stairs when you get to them. The best way I found to do this part is this:

1. Put two big bombs on top of each other against the wall on the other side.
2. Place another big bomb just a little bit away from the 2 big bombs.
3. Make a bunch of little bombs leading back to the wall on the other side, but make them the right distance so that you can bounce from one bomb to another. Go back up the staircase that you went up before and jump on to the bombs you just laid out. If you did it right and get a little lucky. You will bounce across and end up on top of the other side. If you made it, head for the elevator and continue down the paths until you're by the other elevator. You will see that there is a floor now connecting the two other floors. A lot of people must have wondered how to get those there. Go across those floors and you will find a box. Blow up the box and you'll get it.
Duck Float - This custom part can be found in Stage 1 of Rainbow Palace. First you must reach the switch using a bunch of bombs. Once you get the switch, a few platforms will move, letting you reach the exit. Before going to the exit, reach the last platform in front of it and pump a bomb (remote bombs are a must). Throw the bomb onto the platform directly to your right. Pump another bomb and throw it to the platform after the first to your right and lastly, pump one more bomb and throw it onto the last pumped bomb so that it bounces off a lands on another platform (the one closest to the custom part). Then you jump on the first bomb (just fall onto it and let yourself bounce to a platform. DON'T tilt the joystick while you do it or you'll bounce off a fall down). You'll bounce to the next bomb and then to a high platform. Fall from there to your other bomb and you'll land on the platofrm where there's a block that contains the Duck Float. I found it useful to get a heart item first (usually from Blue Resort) before you try this. Drop a bomb in front of the block and detonate it. Your heart item will protect you from the blast and the Duck Float is yours (it's probably much easier to fall and die after you get this than to work your way back).
Golden Armor - Beat Bomberman 64 on hard mode with 120 gold cards in under 3 hours. This will give you a gold suit, which includes: gold visor, gold suit, gold shoes, and gold glove.

Bonus Battle Levels:
Go to the main menu, highlight BATTLE, and press START repeatedly as quickly as possible. If you're quick enough you'll hear a chime sound and all 10 battle arenas will be available.