Stack Em is a highly volatile slot game developed by Hacksaw Gaming. With the charming Canny the Can and his friend Mona the Mouse, the idyllic countryside visuals are simply awe-inspiring. However, don't let the innocent settings deceive you as this game comes with a brutal volatility where larger payouts tend to come in sudden spikes seemingly out of nowhere. Stack Em is a vastly superior follow-up release by Hacksaw Gaming compared to their original title, Stick Em.

Features:

- The wild symbol in the game can land anywhere and replaces all regular pay symbols to create winning combinations.
- When you land a winning cluster of symbols ranging between 5 to 25+, all non-winning symbols are removed from the grid, and a fresh batch of symbols drops down from above to repeat the winning process as long as it continues.
- Retained stacks of winning symbols generate a multiplier that is present below each reel. The respective reel multiplier values are equal to the number of symbols stacked on each reel.
- In case of a full reel, a 6x multiplier is awarded.
- All reel multipliers included in a win are added together up to 30x.
- The Bonus Round is triggered when 3 scatters are landed anywhere during the same cascading sequence. This gives players 5 free spins from the start, displayed as hearts above the grid.
- A progressive global multiplier is also present above the reels for players to keep track of, and it increases by a number equal to the number of winning symbols in each cluster that is landed.
- In the Bonus Round, players have two new special symbols to work with. The X symbol is used to boost the winning sum by the current global multiplier when the winning clusters are adjacent to the X symbol. The ? symbol is used to add +2 to +5 hearts to the player's free spins tally and can add +1 to +50 to the global multiplier. This symbol can also multiply the current multiplier by x2, x3, x4 or x5.
- Impatient players who want a quick go at the main feature can purchase the bonus round directly by setting themselves back 129x their stake.

Overall, Stack Em's gameplay is innovative, and the math model is vastly better than its predecessor. The game is highly volatile, with features such as the Retained Stacks of Winning Symbols and the Bonus Round. The game's mechanics are straightforward and easy to understand, the reels and symbols screen is user-friendly, and the features provide players with the chance to win big payouts.