Famicom Mini - Super Mario Bros - 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.