The Hold and Win feature activates when 6 or more gold coin bonus symbols land anywhere on the grid in a single spin. Standard symbols then fade away, leaving only the activating coins locked onto a specialised respin grid.
The feature grants 3 initial respins. Each time a new gold coin, jackpot token or mystery chest lands on an open position, it locks and immediately resets the respin counter to 3. Mystery symbols reveal themselves at the end of the round, turning into random values or fixed jackpots. Filling all 20 positions on the 5×4 layout awards the Grand Jackpot multiplier on top of accumulated coin values, subject to the 3,000x total-win cap.
Worth knowing: a full grid is rare. Most rounds end with a partial board, which is why the Squid boost carries so much weight in the maths.