New Costumes
While selecting your golfer at the character select screen press C-Left, C-Right, C-Up, C-Down

Replay Hole
First you pause the game during the hole you want to replay then pick the save and quit option. Now select continue to tee off at the same hole

Stop Swing
PreB immediately after pressing the A button to swing

Get Left Handed Golfer
Press L while selecting your golfer at the character select screen

Taunt Opponent
While your opponent is swinging press C-Left , C-Up, C-Down or C-Right to taunt

Compliment Opponent
Use the D Pad in any direction during opponent's turn

Get Donkey Kong
Get all 36 rings on all 6 courses (Also reported that it just takes 30 rings on 5 courses)

New End Sequence
After finishing the game with any character, that character will be featured in the end sequence

Be Luigi
Use Get Character Mode and defeat Luigi

Be Yoshi
Use Get Character Mode and after unlocking Luigi, defeat Yoshi

Be Sonny
se Get Character Mode and after unlocking Yoshi, defeat Sonny

Be Wario
Use Get Character Mode and after unlocking Sonny, defeat Wario

Be Harry
Use Get Character Mode and after unlocking Wario, defeat Harry

Be Mario
Use Get Character Mode and after unlocking Harry, defeat Mario

Be Bowser
Use Get Character Mode and after unlocking Mario, defeat Bowser

Password Screen
At the main menu highlight the the option labeled club house and press Z+R+A at the same time

Get Maple
Earn birdie badges on 50 different holes in tournament mode. To get a birdie badge, just get a birdie or better, and only one badge can be earned per hole.

Be Metal Mario
To unlock Metal Mario as a playable character, collect all 108 Birdie Badges from the six courses in the tournament mode. (You can check to see which badges you have already won in a specific tournament by pausing the game WHILE PLAYING that tournament. Select "Score Card," and then view the second screen. This screen will show which holes you have one the birdie badges on for that course!!

Toad Highlands Tournament
Put in KPXWN9N3 as the password

Get 1st Camp Hyrule Cup
Put in 0EQ561G2 as the password

Get 2ND Camp Hyrule Cup
Put in 5VW689O6 as the password

Different Intro
After unlocking Donkey Kong put in any 8 characters for the password. Ignore the Invalid Password message. Go back to the Press Start screen at the main menu and wait until the intro plays and you will see Donkey Kong instead of Yoshi

Get Mario Star Course
After unlocking 5 other courses in the game score at least 2200 points

Hit Ball Faster & Futher
After hitting the ball, PRESS B

Hit the ball further
While you are lining up the courser hold Z & down on the joystick. You will hit the ball from underneath and your ball will go about twenty yards farther.

More Roll
After hitting ball and it lands press Z rapidly to get more role on the ball and make it go a few yards farther.Helps a lot when you just miss a green you can press Z and it will role farther on the green hopefully. Hope this helps!!!!

See your shot again
To have a replay of your shot simply press the B button right before your shot is finished

Easy Way to Score
Try these to lower your shot average.
-When its your turn pause the game then click on View Coarse or something. That way you can see a overhead shot.
-If your in a bunker or a couple of yards away from the green, use the approch club instead.
-Try useing the power clubs at the beggining.
-Press B before stroking to hit farther shots.

Shy Guy Desert
One more code left. To get Shy Guy Desert you need 300 points. By now tou should get Sonny. Unlike Koopa Park where it's wet as the rainforest it hardly rains here. But sand on the sides of the fairways makes up for waters absence. And remember. If the ball is almost completely covered in sand, hit it about 2 1/2 time harder than you would on a fairway and get under the ball. To do this hold down Z before you hit and pull down on the controller stick. Sorry I can't tell you how many points for Boo Classic, but I think it is 1500. Check Slash420 for Mario Star. A hint for Mario Star if your not there yet is that all the holes look like characters and its fun to teach your kid bro or sis the names of them like I did. The hardest hole in the entire game I think is A hole on Mario Star where there are tiny little Islands of Fairway surrounded by deep rough. It is in the shape of the black thing with a round head and teeth. I think they are chomp chomps. For Bo!
o Clasic be sure not to hit it in the white stuff. That's an O.B. Boo Classic is easy. I have 14 birdie badges in 3 rounds with Sonny/Maple. It took me 9 for Toad Highlands. Well Good Luck on all 3.

Get Koopa Park
To get Koopa park, all you need is 50 points or a Gold Trophy at Toad highlands. This is a little to tougher than Toad HighLands. I got my only hole in one on the 16th hole. It will be hard to win with peach or mario jr. so try to unlock Luigi or Yoshi even. Also I think the 8th hole was from the U.S. Open. Good luck

Get Yoshi Championship
To get the 4th course in Mario Golf, Get 1000 exp. points. This course is very hard. I have all 6 courses open and this is tvhe only one I have no gotten an eagle on. Don't be distracted by the sounds you here when you are swinging like DK making sounds in the distance. Good Luck!

Play as Kid, Sherry, Azeala, and Joe
Get Kid, Sherry, Azeala, and Joe on Mario Golf for Game Boy Color and transfer them to the N64 and they will be in the empty four spots at the bottom.

Stop Ball
When you take a shot and it looks like it is going to fast and is going to roll to far just do this when the ball is rolling pull back on the joystick, press Z, and press A Then your ball will stop right in its place!!

Character Info
I know about most of the characters in this game and, if it helps, I can tell you about them.
PLUM: Peach's daughter, I think. Has the weakest drive, 208 yds. You start off with her.
CHARLIE: Appearantly having a bad hair day. His drive's better, at 210 yds., but it curves a little. You start off with him.
PEACH: A pretty good character for beginners.
She has a drive of 212 yds., and, best of all, you start off with her. Not bad, eh?
BABY MARIO: A very strong...crier. Takes after Mario a lot. He has a slightly curved drive of 215 yds. He's a starter, too.
LUIGI: An OK golfer, he is still hidden in Mario's shadow. He's 40 yds softer than Mario (230 yds.) He's in Get Character Mode.
YOSHI: A straight-forward dinosaur, Yoshi is one of the best golfers in the game. He must be earned in Get Character Mode. He drives 230 yds.
SONNY: I have never seen him in any other game before. He drives 240 and is a Get Character Mode player. The whole encheladda.
WARIO: He might just've found his sport here.
His ball is electric and goes 250 yds, so I believe he must be cheating. He's a Get Character.
HARRY: Not much to say. He drives 260 and is a Get Character. He's pretty easy to earn. But his goatee's cool. I wish I had one.
MARIO: Yet again, Mario's got his own game, and is playing to his fullest. With a 270 yd drive, he's a force to be reckoned with. A Get Character as well.
MAPLE: Better than Peach and Yoshi combined, she's a 1 in a million player. To get her, simply earn 50 Birdie Badges from the tournament mode. She drives 245. Did I mention she's good?
DK: Oddly, this muscle-packed primate plays golf with one hand (a.k.a. he's strong). Get 30 Ring Shots completed to earn him. He's a long driver at 275. He puts Mario to shame!
BOWSER: His motto is "give up or get out". His short game isn't very good, but he makes up for it with a 280yd drive. I still haven't beaten him!
METAL MARIO: I have no idea whatsoever about Metal Mario except you need every Birdie Badge
to get him. And he's made of metal, so his drives must be long.

There's also 4 extra characters you can earn in Mario Golf for Game Boy and transferred to the N64. They remain unknown. Well, ciao!