If you're playing any one of the remakes of Super Mario Bros. 2, then you know that occasionally a powerup, like a heart or a Starman, will appear, completely at random.
But, did you know that it's not completely random? Heck, it's not even partially random. Those powerups appear based on your actions.
Like if you kill five enemies, you'll make a heart appear to replenish one dot on your life meter.
Likewise, if you collect five cherries, a Starman will appear, which will make you temporarily invincible when you collect it.
And pulling five fully-grown vegetables out of the ground (the ones with the face on them) will get you a stopwatch.
Which will freeze everything in place for a few seconds.
And since everything resets when you go in the nearest door, you can totally manipulate the game to your advantage, so go to it!