Pearl Harbor

The playing field uses a dynamic 7x7 grid. At the start of each round, only the central 3x3 section is active, while the remaining positions are locked. Wins are formed by landing five or more identical symbols connected horizontally and/or vertically within the active area. After a winning Cluster is created, all symbols involved are removed, allowing new symbols to cascade into place. Any multipliers attached to symbols within a winning Cluster are added together along with any round multiplier gained from previous xBomb effects. The total multiplier is then applied to the Cluster’s payout value. The active area can expand during gameplay through the following features:
-xBomb explosions
-Target symbols
-Colossal symbols

During the base game, the Scatter symbol can appear on any reel, but it only has effect if it lands within the active reel area. If a Scatter symbol is split and a bonus mode is activated, the Scatter’s multiplier value is converted into an (x)-multiplier and applied as the first addition to the bonus round multiplier. Only one Scatter symbol can appear per reel.

The xBomb Wild can destroy up to 10 surrounding symbols within the active area. xBombs only detonate inside the active reel area. If an xBomb lands next to the border of the active area, it shifts the active area by one reel or one row. When positioned in a corner of the active area, it expands the area by one reel and one row. When an xBomb is split, it receives a x2 multiplier on the first split. Each additional split doubles its multiplier again. Once an xBomb explodes, it increases the win multiplier for the following avalanche by either +1 or by its current (x)-multiplier value after splitting. All xBombs will detonate before the next avalanche begins. Scatter symbols and transformed Wilds that are not part of a winning Cluster are unaffected and will not be destroyed.

Target symbols can appear anywhere on the reels. When a Target symbol lands, the active reel area expands so that the Target becomes included within the rectangular active zone. Once the Target symbol is inside the active reel area, it transforms into a Wild symbol.

The xSplit symbol is designed as a set of samurai swords and slices through symbols in the direction the sword handles are pointing. An xSplit can initially appear with one or two swords. Each sword may point either horizontally or vertically, but only in a single direction per sword. The xSplit activates only when it is inside the active reel area and after the avalanche sequence has finished.
If an xSplit is struck by another xSplit, it gains an extra sword pointing in a new direction. When an xSplit reaches four swords, any additional split grants it a x2 multiplier. If an xSplit has a multiplier when it activates, all affected symbols inherit the xSplit’s multiplier or have their existing multiplier multiplied by it. Scatter symbols, Target symbols, and xBombs receive a x2 multiplier when hit by an xSplit. Consecutive xSplits applied to already multiplied symbols will double the current multiplier value. After completing its split action, the xSplit symbol transforms into a Wild. The resulting Wild carries a multiplier based on the number of swords it had, and any existing multiplier will further multiply the sword-based multiplier value.

When a Colossal symbol appears, the active reel area expands its rectangular boundaries so that the Colossal symbol becomes part of the active zone. Colossal symbols can appear in 2x2 or 3x3 sizes and may carry a x2 or x3 multiplier. Initially, they count as a single symbol when forming a potential Cluster. If a 3x3 Colossal symbol is hit by an xSplit, it first divides into three symbols either vertically or horizontally, depending on the direction of the split. A second xSplit will divide the symbol again in the opposite direction, resulting in a full 3x3 layout regardless of the split direction. A third xSplit splits all nine parts in half, creating a total of 18 symbols. On the fourth xSplit, each symbol from the original Colossal may receive a x2 multiplier, or each existing multiplier may be doubled. The same mechanics apply to 2x2 Colossal symbols.

3 Scatter symbols activate the Dogfight feature. The feature begins with 3 spins and takes place inside a fighter plane cockpit featuring 18 instrument dials. All dials spin and may land an (x)-multiplier, a (+)-multiplier, or nothing. Whenever any multiplier lands, the spin counter resets back to 3. Landed multipliers stay active until their values are added to the round multiplier. All active (+)-multipliers are added together first, then multiplied by all active (x)-multipliers before the result is added to the round multiplier. Active (x)-multipliers remain in play until a (+)-multiplier appears. If the bonus round ends with active (x)-multipliers, they convert into (+)-multipliers, their values are summed, added to the round multiplier, and the bonus round concludes.

Dogfight Attack:
Fill an entire column of dials.
A Dogfight attack is triggered.
All multipliers in that column become active.
If the enemy plane is hit, the active multipliers are calculated the same way as in a standard bonus spin.
If only (x)-multipliers are present in the column, they are multiplied together and then multiplied by 1 to determine the amount added to the round multiplier.
If the enemy plane is missed, nothing is added and the next spin begins.
If the spin that triggered the Dogfight contained only (x)-multipliers, those (x)-multipliers stay active for the next spin.
Multiple Dogfight attacks occur sequentially from left to right.

Kamikaze Attack:
If all 18 instrument dials are filled, a Kamikaze Attack launches after all Dogfights are completed.
A multiplier wheel with 8 possible outcomes (x1, x2, x3, x5, x10, x15, x30, x50), including misses, spins as the aircraft approaches a target ship.
If the ship is hit, the multiplier from the wheel is applied to the total round multiplier accumulated during the bonus round.

4 Scatter symbols activate the Tora! Tora! Tora! feature. The feature begins with 3 spins and takes place inside a fighter plane cockpit with an instrument panel of 18 different dials. Gameplay mechanics are the same as in Dogfight, with the addition of Midway Pop and Bomb Drop features.

Midway Pop:
Midway Pop is triggered when a Multiplier lands on a dial in the middle row.
The landed value moves up to the top row within the same column.
If no value previously exists in that top position, it will randomly become either a (+)-multiplier or an (x)-multiplier, independent of the mid-row multiplier type.
If a value is already present in the top row, the mid-row amount is added to it while the multiplier type remains unchanged.

Bomb Drop:
Bomb Drop is triggered when a complete row of instrument dials is filled.
A bomb hatch opens, a ship locks into position, and a bomb is released.
If the ship is hit, all (+)-multipliers in that row are added together and then multiplied by all (x)-multipliers in the same row.
If only (x)-multipliers are present in the row, they are multiplied together and then multiplied by 1 to determine the amount added to the round multiplier.
If the ship is missed, nothing is added and the next spin begins.
If the spin that triggered Bomb Drop contained only (x)-multipliers, those (x)-multipliers remain active. Multiple Bomb Drops occur sequentially from top to bottom. Any possible Dogfight attacks are resolved before Bomb Drops are initiated.

By increasing the base bet by +50%, the player is guaranteed one Scatter symbol placed in the center of the active area. This boosts the probability of triggering the Dogfight bonus by more than three times. By increasing the base bet by +100%, the player is guaranteed two Scatter symbols on the initial drop. This significantly improves the chances of activating the Tora! Tora! Tora! bonus by more than ten times. Symbol payout values remain unchanged, meaning all wins are still calculated based on the original base bet.

The maximum possible win in the game is 41,127 times the base bet. If the total winnings in a single round reach or exceed this limit, the round immediately ends and the maximum payout of 41,127x the base bet is awarded.