Each slot provider has developed unique mechanics that define their games. Understanding these features helps you pick slots that match your style and budget.
Megaways™
Dynamic reel layout producing between 324 and 117,649 ways to win per spin. Each reel shows a different number of symbols, making the game highly volatile with massive win potential.
Invented by: Big Time Gaming · Used by: Pragmatic Play, NetEnt
xNudge™
Wild symbols that nudge into full view and multiply their value for every position they nudge. Can stack with other multipliers to create massive chain reactions in a single spin.
Invented by: Nolimit City · Key games: Tombstone, San Quentin xWays
xWays™
A symbol that expands to show 2–4 symbols of the same type, multiplying ways to win exponentially. Combined with xNudge, a single spin can produce millions of ways to win.
Invented by: Nolimit City · Key games: San Quentin xWays, Ragna ROCKs
xBomb™
Wild symbols that explode on landing, removing adjacent symbols and adding a multiplier. Each explosion increases the multiplier, making cascading wins increasingly powerful.
Invented by: Nolimit City · Key games: Fire in the Hole xBomb
DuelReels™
Two separate reel sets that can merge when a special "Duel" symbol appears, combining both grids into one giant payout. Creates tension and anticipation on every spin.
Invented by: Hacksaw Gaming · Key games: Wanted Dead or a Wild
Hold the Spin
Special coin symbols land and stick in place while the remaining reels spin again. Collect enough coins to fill the grid and trigger the Grand Jackpot. Signature mechanic of Gamzix.
Signature mechanic of: Gamzix · Key games: Sunny Coin 10000, Tiger Pot
Scatter Pays
Symbols pay based on their total count anywhere on the reels, regardless of position or paylines. A full grid of scatter symbols triggers the largest possible win.
Used by: Pragmatic Play · Key games: Gates of Olympus, Sweet Bonanza
Sticky Wilds
Wild symbols that stay in place for multiple consecutive spins. NetEnt pioneered this — Dead or Alive 2's sticky wilds in free spins are among the most volatile features in any game ever made.
Pioneered by: NetEnt · Key games: Dead or Alive 2, Starburst
⚠️ Bankroll Warning: High-volatility mechanics like xNudge, DuelReels and Sticky Wilds create long dry spells between big wins. Always set a session budget before playing extreme volatility games, and never chase losses.
