Classic NES Series - Super Mario Bros - Platform: Gameboy Advance

Get fireworks at the end of a level: 
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In order to get fireworks to go off after you beat a level, 
simply finish the level when the last number in the Time is 
either a 1, 3, or 6. The number of fireworks you get depends 
on that number. So finish a level with 106 remaining, and 
you'll get 6 fireworks to explode. Plus, you get bonus points 
for each firework that goes off. 

Level Warp:
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During World 1-2, go to the end of the level and get on the 
rising platforms. Now jump onto the TOP of the level and go 
right until you reach three pipes. You can now warp to either 
World 2, 3 or 4.