Thunder Screech is a 5-reel video slot machine with 10 fixed paylines. Wild symbols substitute for all symbols (except Scatter) and only appear on reels 2, 3, and 4. The Call feature is activated randomly and adds 5 – 9 Wild symbols. Wins calculated after the effect. The Strike feature is activated randomly, upgrading all Wild symbols to Thunder Wild symbols. Thunder Wild symbols substitute for all symbols and only appear on reels 2, 3, and 4. Additionally, the symbol triggers re-spins when landing and is sticky until its multiplier reaches x3. The symbol multiplier always starts at x1, increasing by 1 between each re-spin. When multiple Thunder Wild are present on a payline, the multipliers are added together for a maximum multiplier of x9. Feature ends when no Thunder Wild symbol is present. Scatter symbol on reels 1, 3, and 5 trigger 5 Free Spins. Wild symbols are upgraded to Thunder Wild. During free spins, at least 1 Thunder Wild is guaranteed to land. Once all free spins have been consumed, the game continues via re-spins until no Thunder Wild symbol is present. Additional Free Spins cannot be won. Scatter symbols are not present during Call, Strike and Free Spins features.