Not Enough Kittens (Thunderkick) uses a 5-3 grid with 35 paylines, a 96% RTP and low volatility.

Additionally, Wilds substitute for winning symbols, and the game includes Stack symbols, Bonus symbols, Scatter symbols, Free Spins, a Bonus Game, and a Multiplier. Bet range runs from USD 0.1 to USD 100. An RTP range is listed among the feature set. In practice, these elements define possible win paths and bonus triggers, but without indicating returns beyond the stated RTP. In sum, the game combines symbol substitution mechanics with bonus features on a compact grid.