Das xBoot

Das xBoot by No Limit City is a video slot themed around a World War II submarine, featuring a dark setting, immersive sound effects, and a survival-at-sea atmosphere. The game uses an unusual configuration of 6 reels in a 2-3-4-4-3-2 grid, offering 576 base ways to win, which can drastically expand thanks to the xWays mechanic. It also includes xNudge Wilds: four-rank Wild symbols that move (nudge) to become fully visible, with each nudge increasing a multiplier. The xBomb Wild Multiplier mechanic also appears, exploding non-winning symbols and increasing the overall multiplier as soon as it triggers. Das xBoot offers two free spins modes: the Silent Hunter Spins mode, triggered by three Scatter symbols, where the third reel expands to eight positions and a special Wild "Periscope Wild" can trigger a torpedo sequence, and the Wolf Pack Spins mode, activated with four Scatters, where torpedo coins and xWays Wilds are collected to launch a torpedo, increasing the ways to win and the multiplier. The game also features a Bonus Buy function (depending on jurisdictions) that allows players to enter directly into either of the free spins modes, with a cost expressed in multiples of the bet. The maximum achievable win is x 55,200 the bet, reflecting the game's high potential. The game combines cascading symbols (wins remove winning symbols, with others falling to create new possibilities), evolving Wilds, and persistent multipliers between the base game and free spins.

You can play it for real money.