Are you tired of looking for ways in the 'cheese bridge area' to unlock the level below it 'Soda Lake'? Here's how to do it. You need the feather so you can fly. At the start of the level take off and fly till you go past the chainsaws near the end of the level. You will see the end goal.

Diagram:

1 1
1-1
1 1
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Fly under here->

Once you fly under the goal there will be another one behind it. Go through there to unlock soda lake.