Fortune Cats Golden Stacks is an online slot game inspired by Japanese culture, that captures the essence of cuteness and charm. The game is visually different from Thunderkick's usual style, with simplistic yet delightful graphics that are sure to attract a certain crowd. Here are the main features and mechanics of the game:

- The game has 5 reels and 3 rows, with 20 fixed paylines.
- The symbols include cat-related items such as fish, toys, and lucky charms, along with the classic A, K, Q, J, and 10 symbols.
- The Golden Cat symbol is the highest paying symbol, with a potential payout of 7.5 times your stake for 5 of a kind wins.
- The Wild symbol can substitute for all regular symbols, except for the scatter.
- The Mystery Symbol can appear on all reels, and when it lands, it reveals a Chinese fan that unfolds and turns itself and a randomly chosen symbol type into the top-value Golden Cat symbol.
- The Bonus Round is triggered by landing 3 cat scatters anywhere on the reels. This awards 10 free spins.
- Landing 4 or 5 scatters unlocks the second and third reel sets, respectively, from the beginning of the feature.
- Collecting scatters during the feature can also unlock the extra reel sets, with 3 scatters unlocking the second reel set, and 5 more scatters unlocking the third reel set.
- The Golden Stacks feature can trigger once more than 1 reel set is unlocked, and if a reel is filled with Golden Cat symbols on one reel set, it will be cloned to the corresponding reel on all other active reel sets.
- The game has a 2,500x potential payout, with a medium volatility and an RTP range.

Overall, Fortune Cats Golden Stacks is a delightful online slot game with charming visuals and fun mechanics. The Mystery Symbol feature adds an exciting element to the gameplay, while the Bonus Round and Golden Stacks feature offer great potential for bigger payouts. Give it a try and see if you're lucky enough to land a big win!