Turn around at the beginning of Level 2 in Beginner's mode and you should see a ramp. Get enough speed and you should fall onto another platform. Just roll to the finish and you will warp to Level 5 and pick up about 80,000-100,000 points (depending on how fast you do it).
Once you have earned the first 2,500 points in the game, save to memory. Now go to the Mini-games section. One there, you will see options to purchase one of the three mini-games -- Monkey Pool, Monkey Bowling or Monkey Golf. Each one costs 2,500 points.
The trick here is to remove your memory card from the machine at this point. Now you can select whichever mini game you'd like to play and it the game will not deduct the points from your earnings, as it won't be able to save. If you'd like to try a different mini game, simply reset Super Monkey Ball and repeat the process.
You must play through Advanced mode without losing a life to unlock 5 levels.
You must go through Beginner mode without losing a life. This will unlock 3 levels.
You must go through expert mode without using continue. This will unlock 10 levels.
After you’ve unlocked all of the minigames in the game, you can get extra continues by getting 2,500 points. So, each time you get 2,500 points, you should be rewarded with an extra continue!
You have to complete Expert & Expert Extra levels without using a continue.
Beat expert and extra expert without using continues to unlock master mode in Super Monkey Ball.
You must first unlock all three mini-games and the menu screen theme will unlock a different song.