As developer Insomniac Games celebrated the 4th anniversary of Ratchet & Clank: Rift Apart, game designer Grant Parker showed off a secret mini-game in the game that no one, to our knowledge, had discovered in all this time!
In the tweet below, you can see how to access this mini-game, in which you ride a robotic bull and try not to fall off it while it moves. Note that this mini-game is available in an incomplete prototype, as is clear from the trailer.
