Certain
Certain adjective - Known but not named.
Flipper
Flipper noun - The flat broad limb of aquatic animals specialized for swimming.
Both words in one sentence
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On the attract modes of both Revenge from Mars and Star Wars Episode I, pressing the flipper buttons in a certain sequencenote Left and right together, then right, left, right, right, left, right, right, right, left, and left will show a picture of the development team.
Source: Easter Egg -
Easter Egg: During the attract mode, pressing the flipper buttons in a certain sequencenote Left and right together, then right, left, right, right, left, right, right, right, left, and left will show a picture of the development team.
Source: Pinball / Revenge from Mars -
That doesn't sound like a lot until you actually try playing a game with its standard flippers replaced with Lightning Flippers: Not only is the hole between the flippers wider, but certain flipper techniques become more difficult and others outright impossible with Lightning Flippers.
Source: Self-Imposed Challenge
Cite this Source
Flipper and Certain. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/certain/flipper
Certain & Flipper. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/certain/flipper>.
Flipper or Certain. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/certain/flipper.
Google Ngram Viewer shows how "certain" and "flipper" have occurred on timeline