Play as Spike:
Successfully complete the game after finding all 297 monkeys. Highlight "New Game" at the main menu, then press L1 + Start to play as Spike from the original Ape Escape.
Easy 999 Coins
On your second time through the game, go to Simian Citadel and track down the magician monkey, Tommy, who hangs out by the fountain. Don't net him! Instead, let him summon his mouse thieves, and let them steal some of your money. When you hit them and they drop your coins, there will often be enough floating around to trigger the multipliers, turning the single coins that they stole into x 5 and x 10 coins. Grab them and you'll have way more money than you started with. Since Tommy will always supply more thieves, you can do this over and over until you've maxed out your coinage.
Submitted by: Hunter
Scroll Credits Faster
To scroll through the credits quicker, hold down X.
Unlock monkey football mini-game
To get monkey footy complete the level enter the monkey and monkey football will appear in the gotcha box sometime
submitted by: Rudedude
Alternate ending
Get all 300 monkeys to face the real final Boss. Win the battle to view the good ending.
Unlimited lives
In the Ninja Hideout level, there is a garden of bamboo plants. Also nearby are a couple of rocks. If you break the rocks with your stick, there will be some cookies and a jacket. You can keep going to another part of the level and returning. The cookies and life will be there again. Do this as many times as needed to get 99 lives. Note: The fastest way to do this is to wear your Super Hoop to move faster.
Submitted by: Hunter
Dance Monkey Dance mini-game
Successfully complete the Ninja Hideout level.
Monkey Climber mini-game
Defeat Specter to unlock the Monkey Climber mini-game.
Submitted by: Hunter
Monkey Soccer mini-game
Successfully complete the Enter The Monkey level.