Novak Volt · Slot release
Mice in the Walls
Mice in the Walls is a cluster-pays slot from Novak Volt, based on the Three Little Mice tale, where builder mice upgrade wall cells on a 6x5 grid until an orange tomcat raids them.
By the Reel Bulletin desk · Updated 9 Nov 2026
Builder mice are the premium symbols here: the Hauler, Engineer, Veteran and Lookout. The low tier is made up of their tools, namely trowel and brick, saw, rope coil, hammer and hatchet. Wins come from clusters of five or more matching symbols touching horizontally or vertically on a six-by-five grid.
Winning symbols disappear and leave a cell in their place before replacements cascade in. Cells that take part in further wins upgrade through Cardboard, Matchwood, Tin and Gold. The Cat is the disruptor: when it lands it rips the cells open, revealing values along with EXTRA, RESET and MULTI modifiers. Landing three, four or five alarm-bell Scatters opens one of three separate free-spin bonuses.
Base RTP is 96.14%, and the maximum win is 10,000x. Ante 1 is a toggle at 5x the stake with the same 96.14%. Bonus 1 and Ante 2 are each priced at 100x (96.13%), Bonus 2 costs 175x (96.11%) and Bonus 3 costs 400x (96.07%). With very high volatility, the cell-building loop can take a while to pay off.
Wondering how a session of Mice in the Walls tends to go? RTPDaily works out session odds from its sampled maths.
Every way to play
Price and top win as multiples of the bet
| Mode | Price | RTP | Top win | Top win odds |
|---|---|---|---|---|
| Base · Base game | 1x | 96.14% | 10,000x | 1 in 100,217 |
| Ante 1 · Feature mode | 5x | 96.14% | 10,000x | 1 in 303,586 |
| Bonus 1 · Bonus buy | 100x | 96.13% | 10,000x | 1 in 100,274 |
| Ante 2 · Bonus buy | 100x | 96.13% | 10,000x | 1 in 100,001 |
| Bonus 2 · Bonus buy | 175x | 96.11% | 10,000x | 1 in 20,002 |
| Bonus 3 · Bonus buy | 400x | 96.07% | 10,000x | 1 in 2,382 |
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