World 2-1 (NSMB)

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World 2-1 is the first desert-themed level in New Super Mario Bros. The enemies are only Pokeys and 1 Spiny next to the second Pokey. The first Pokey can be jumped over by a moving platform. The others each have a certain trick to avoid it (Fire Mario, though, can incinerate them, segment by segment.), e.g. a block that grows taller when you hit it, but goes back to normal if you leave it too long (In this scenario, the aforementioned Spiny is the real annoyance. Try to defeat it any way you can.).

There are quicksand/pits next, making it hard to evade the Pokeys. The Star Coins here are relatively easy to get.

In the next part of the level, the Pokeys appear on lifts that go up and down over pits. You need good timing, and on the level segment with two sets of lifts before the Pokey itself, do not stay too long on either set. Soon after this, you are rewarded with the flagpole.