Fine, here's a step by step tutorial.
1. Make a new map and add terrain, locations, and starting points. (Use this step to refer to locations I use in further steps and pictures.
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2. Open trigger editor and make your obstacle.
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3. Make another obstacle.
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4. Make a hypertrigger (Wait(0);×62, PreserveTrigger();, Commen("Hypertrigger")
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5. Duplicate the hypertrigger about 10 times.
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6. Make your zerglings appear, set switch 1, and set the score. (Leaderboard is simply the score in the top left corner of the screen during gameplay)
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7. Make the revive trigger for Level 1.
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8. Make the revive trigger for Level 2.
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9. Add a trigger which stops the previous level and starts the next one.
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10. Add a trigger which stops the previous level and makes you victorious.
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If those were not enough, here is the map for you to observe.
[attachmentid=19042]