Extra Life
When you are in the first level, Arctic Antics , At the end of the level, there is a mammoth up on a cliff. Jump onto the furry rascal and you will get an extra life.

Easy Lives
To get easy lives, you must have beaten the fourth boss and have the bazooka. Then go to level 1. Around the place are those big elephants. Shoot them. There are three elephants. For each time you kill one, you gain 1 life. A better way, is to shoot the elephants, go to the beginning of the level, die, then shoot them again.

Defeat N.Gin
To defeat N.Gin, shoot at the flashing pads on his robot suit. Four of the pads on the first suit will fall off. The pad underneath his viewing area will not fall off: it will just stop flashing. The two easiest pads to hit are the ones that fire missiles, (the middle is also quite easy too), then his arms are the last two. When he brings up his arm, there will be a few seconds before he starts firing, so this is the best time to shoot at the end of his arms. When you have destroyed all the flashing pads, then he will get into another suit which is even harder.
This time, the flashing pads are four missile launchers, one on the far left, and one on the far right. The last one is just under N.Gin's ugly mug. Hit and destroy all these pads, and you have and apple bazooka!!!

Beat Time Trail Fast on Dragon Level
On the level that you are being chased by the dinosaur/dragon you can beat the level very fast. On time trail right when you get chased by the dragon after the ? mark platform press select and you will be telepoted to the end by the nitro boxes.

Unlimited Lives
On level 1 after you get the crystal, do it again. Don't get the time trial yet. Get the berries and boxes. Then go get the clock and kill yourself. Do this over and over again and you will have many lives.