Nitropolis 4

Nitropolis 4 features a 6-reel, 4-row layout that can expand to 8 rows, starting with 4,096 ways to win and potentially reaching up to 262,144 ways. The game is set on a disused oil rig, providing a unique backdrop compared to previous entries. The RTP is 94%, and it is classified as a high-volatility slot, ideal for players who enjoy big risks and big rewards. Betting ranges from €0.20 to €50, making it accessible to a variety of players.

Symbols include the high-paying Dirty Dawgs, Pug Thugs, Gritty Kitties, and Rogue Rats, along with low-paying A-J royals. The wild symbol is represented by a bomb, substituting for all symbols except for bonus and super bonus symbols.

• Avalanche mechanic: Winning symbols are removed from the board, and new symbols drop down to fill the gaps, with an additional row added up to a maximum of 8 rows. This continues until no new wins occur.
• Nitro Reels: These special reels cover two positions and contain 4 to 12 regular-sized payout symbols. Big Nitro Reels cover six positions and contain 2×2 payout symbols. When part of a win, they stay on the grid and respin.
• Nitro Multiplier: These symbols cover two positions and multiply all wins in view by values of x4, x6, x8, x10, or x12. Multipliers stack if more than one is in view.
• Nitro Booster: Above the grid are two displays that can award one of eight Nitro Booster modifiers, including:
  • Redrop: Bonus symbols and Nitro Reels are held while other symbols respin.
  • Both Ways: Wins pay both ways on the grid.
  • Garbage Collect: Random symbols are removed, triggering an Avalanche.
  • Max Rows: The grid expands to its full 8-row height.
  • Nitro Appear: A random-sized Nitro Reel is placed on the board.
  • Nitro Wild: An existing Nitro Reel is filled with wilds.
  • Nitro Upgrade: A Nitro Reel’s value is increased.
  • Nitro Match: An existing Nitro Reel matches another symbol to create a win.
• Bonus Game: Landing 3, 4, 5, or 6 bonus symbols awards 8, 12, 16, or 20 free spins, respectively. During free spins, Nitro Reels are sticky, and each win increases the safety level by one row, with the next free spin starting at the new level. A Super Bonus symbol triggers the Super Bonus Game with Max Rows and Both Ways active from the start.
• X-iter: This feature allows players to choose from five game modes:
  • Bonus Hunt: 2x the bet for a spin with increased chance of triggering the bonus game.
  • Nitro Booster: 10x the bet for a spin with two Nitro Booster features.
  • Super Spin: 25x the bet for a spin with Max Rows and Both Ways active.
  • Bonus: 100x the bet for guaranteed entry to the bonus game.
  • Super Bonus: 500x the bet for guaranteed entry to the Super Bonus Game.