Yellow is the fourth color of the flow levels.
It appears on almost every single level. However, there may be a few levels from Daily Puzzles where it doesn't appear.
- It is known to be the fourth color, due to several instances. One of them being the title of the Flow Free App "flow" that is colored this way. Yellow is the color that appears in the fourth letter of the word, which is why it is the fourth color.
- It is a greenish-red color. It is evoked by light with a predominant wavelength between the wavelengths of Green and Red.
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