Kingmaker Fully Loaded has the same aesthetic as the original, with a beautiful scene of blue skies, snowy mountains, green grass, and a lake whose waters are so clean they vividly reflect its surroundings. A white castle with vivid red spires is visible on the right side of the screen, and each symbol on the reels has the appearance of stained glass, with the background just very slightly tinted to let the scenery through. The loop sounds almost completely overpower the soft and calm but triumphant audios.

With 5 reels and a possible total of 2 to 7 symbols on each, there may be up to 16,807 different ways to win. Matching at least three symbols in any order on neighboring reels, starting at the leftmost reel, results in wins. The available symbols are the lower paying 9, 10, J, Q, K, and As, which pay between 0.1 and 0.2x bet for three-of-a-kind victories and between 0.3 and 0.4x bet for five-of-a-kind matches. As we move to the top of the pay table, we encounter a variety of gems that are colored green, blue, red, and purple and each have different engravings on them. Landing three identical green, blue, or red gems will result in wins between 0.25 and 0.3x bet, while landing five identical gems will result in wins between 0.5 and 0.7x stake. Purple diamonds, which pay 0.75 times the stake, are the highest earning and the only symbol that pays in both directions. Wins of 10x bet are yours if you land five identical purple gems. Wilds, which are represented by golden crowns and appear on reels 2, 3, 4, and 5, can replace all other symbols except Scatters.

7, 12, or 20 free spins are awarded for landing 3, 4 or 5 scatters, with the corresponding trigger values being 4x, 20x, or 250x the stake. The feature will start when the sun sets inside the castle walls, in a room decorated with gold coins and dim lights. A win multiplier, which is the total of all individual Gem Multipliers granted at random at the start of the triggering spin, is active during free spins. All winnings during free spins—defined as at least 3 of a kind of any symbol, with the exception of the top-most purple diamond, which requires just 2 symbols to produce a win—are multiplied by the win multiplier, which is shown to the left of the reels. The Kingmaker Fully Loaded free spins offer 7 symbols on each reel for a total of 16,807 ways to win, which is the maximum number of Megaways the game allows on every spin, just like the original. Retriggering the feature will grant an extra +7, +12, or +20 free spins depending on the number of Scatters that land during the feature's free spins.