Stack'em is a 2021 Hacksaw Gaming slot that follows up on Stick'em with a new cluster pays format. It uses a 5x6 grid where symbols stack up on each reel to build multipliers, and a free spins round with a growing global multiplier. The maximum win is 10,000x. It suits you if you want a high volatility cluster game with a straightforward multiplier idea.
How does Stack'em work?
Wins come from clusters of five or more matching symbols. After each win, the non winning symbols are cleared and new ones drop in, which continues until no new cluster forms.
As symbols stack on a reel, they set a reel multiplier. Combined, these can reach up to 30x on a single spin. Wilds can land anywhere and substitute for the regular pay symbols.
Stakes run from 0.20 to 100 per spin. The grid stays easy to read during long cascade chains, and the reel multipliers update on screen as symbols stack, so you always know what the next win is worth.
What are the Stack'em bonus features?
Three scatters within the same cascade sequence trigger the bonus with five free spins. A question mark symbol can add two to five extra spins during the round.
In free spins a global multiplier rises with every winning symbol, and it does not reset. Only wins next to the special X symbol receive this multiplier, so where the X lands matters a lot. Outside the UK you can buy the bonus for 129x your stake.
Is Stack'em worth playing? RTP and volatility explained
The listed RTP is about 96.2%. Like most Hacksaw slots, the game is offered with adjustable RTP settings, so the version at your casino may be lower. Check the game rules.
Volatility is high. A lot of the value sits in the free spins, where the global multiplier can grow large, while the base game delivers smaller and more frequent results.
An RTP of 96.2% is a long-run average measured over millions of spins. In theory about 96.2 units come back for every 100 wagered, but a single session can end far above or below that. Volatility describes how those returns are spread out, and at high volatility you should expect fewer wins, longer losing runs and a bigger share of the return concentrated in rare large hits.
Tips before you play Stack'em
- Check the paytable for the RTP before you spin.
- In free spins, keep an eye on the X symbol, as it decides which wins get the multiplier.
- Factor the 129x bonus price into your budget before buying.
- Set a deposit or loss limit in your casino account before you start, and stop when you reach it.