On October 21, John Bollinger pointed out on X the presence of a small bird in the bottom-left corner of CoinMarketCap. Clicking it opens the hidden Bitcoin Bird game, which recreates the Flappy Bird concept using Bitcoin’s historical price. Players must guide the bird between the upper and lower Bollinger Bands without touching either boundary. Invented by Bollinger in the early 1980s, these bands are used to measure market volatility and assess whether a price is high or low relative to a recent trading range.
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