Big Max Door is a 5-reel, 4-row video slot. Wild symbols substitute for all symbols except Scatter. 3 or more Scatter symbols trigger bonus games.
3 or more Scatter symbols trigger the Feature games. When Feature games are triggered, the second and fourth reels are filled with Mystery Stacks. During Feature games, a multiplier is applied to all wins. The multiplier starts at 1x. Each time a Reveal Feature is triggered without a Mystery Reveal Feature, the multiplier increases at the start of the next round. Feature games continue until there are no Mystery Stacks left anywhere on the table. Feature games will be played at the stake of the last regular round.
When a Mystery Stack appears on the reels, the Reveal feature is activated. At the start of the round, all Mystery Stacks are dropped by 1 position. Mystery Stacks only count towards the bet level they were reached at.
The Wild symbol replaces all symbols except Scatter.
3 or more Scatter symbols trigger Feature games. Each additional Scatter awards +1 to Feature Games; each +1 causes the Mystery Stacks to move up 1 position. +1 will not move the Mystery Stacks up when they leave the game table. Instead, they will remain in their current position.
When the Reveal feature is activated, the mystery stacks are revealed and either paying symbols or golden wild symbols appear.
The Mystery Reveal feature is activated when the Mystery Stack reveals a Golden Wild. Once activated, each Mystery Stack symbol position will spin and land on either the Bet Multiplier Coins or Scatter symbols.
20 paylines pay from left to right on adjacent reels, excluding Scatter. Only the highest combination on a payline pays. Wins on paylines are added together.