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Successfully complete the game in hard mode.

Hold Select and press L(2), B, A, R at the level selection screen. A list of bonus games will appear. If you win the selected game you will get a prize.

After completing the game, an extra level for each world will appear.

Get 1,000 points in a world (100 points on all ten levels including Extra and Secret levels). A star will appear on the game selection screen. Get five stars on that screen to unlock hard mode.

First jump on an enemy and you will be in the air, while you are in the air hold down A and you will get an extra boost.