Beyond the bonus features, you need to spin at least three symbols in a row on a winning payline to take away a prize. Here are the symbols you need to look for, and how many you need to claim prizes:
Ten: 3: 0.20x, 4: 0.40x, 5: 2x
Jack: 3: 0.20x, 4: 0.40x, 5: 2x
Queen: 3: 0.30x, 4: 0.60x, 5: 3x
King: 3: 0.30x, 4: 0.60x, 5: 3x
Ace: 3: 0.40x, 4: 0.80x, 5: 4x
Lady Guinevere: 3: 1x, 4: 1.5x, 5: 7.5x
King Arthur: 3: 1x, 4: 1.5x, 5: 7.5x
Morgan: 3: 1.2x, 4: 2.5x, 5: 12.5x
Sir Gawain: 3: 2.5x, 4: 5x, 5: 25x
Keep your eyes peeled for shield wilds, which replace symbols and offer up to 100x your bet; multiplier wilds, which boost wild line wins up to 100x; and the Green Knight himself, who’s a scatter that triggers the free spins and Shield Spins features.