Merge Up Slot Overview
Merge Up is a Cluster Pays slot from BGaming running on a 6x6 grid, released in October 2023. Winning symbols don't just vanish here; they merge upwards into higher-value gems while fresh ones cascade in from above. I loaded this one up expecting another generic gem slot, and if I'm honest with chat, the theme is exactly that. But the core loop, merge into cascade into merge again, gives sessions a sense of momentum I wasn't expecting.
RTP sits at up to 97.25%, volatility is very high, and the max win caps at 5,000x. Hit frequency is 32.89%, so roughly a third of spins produce something. Bets range from 0.20 to 50. No Wild symbol in this game, which is unusual, but the merge mechanic fills that gap.
Symbols and Paytable
Every symbol on the grid is a gemstone, and they follow a 9-level progression. Clusters of 4 or more matching gems create a win. Lower-paying gems are orange, red, green, and dark blue; landing 12+ of these in a cluster pays between 5x and 20x. Higher-paying gems are yellow, light blue, red heart, and purple, paying between 25x and 50x for 12+ clusters.
Purple gems sit at level 8. When a purple cluster forms and pays out, it converts into a Scatter symbol, which is the 9th and final level of the merge chain. Four or more Scatters trigger Free Spins. I quite like this design because it means the bonus can technically trigger organically from a long enough merge chain, not just from random Scatter drops.
Symbol Payouts
| 12+ | x50 |
| 11 | x20 |
| 10 | x15 |
| 6 | x2 |
| 5 | x1.5 |
| 4 | x1 |
| 12+ | x40 |
| 11 | x15 |
| 10 | x10 |
| 6 | x1.5 |
| 5 | x1 |
| 4 | x0.8 |
| 12+ | x30 |
| 11 | x10 |
| 10 | x8 |
| 6 | x1 |
| 5 | x0.8 |
| 4 | x0.6 |
| 12+ | x25 |
| 11 | x8 |
| 10 | x6 |
| 7 | x0.8 |
| 6 | x0.6 |
| 5 | x0.5 |
| 12+ | x20 |
| 11 | x6 |
| 10 | x5 |
| 7 | x0.6 |
| 6 | x0.5 |
| 5 | x0.4 |
| 12+ | x15 |
| 11 | x5 |
| 10 | x4 |
| 7 | x0.5 |
| 6 | x0.4 |
| 5 | x0.3 |
| 12+ | x10 |
| 11 | x4 |
| 10 | x3 |
| 7 | x0.4 |
| 6 | x0.3 |
| 5 | x0.2 |
| 12+ | x5 |
| 11 | x3 |
| 10 | x2 |
| 7 | x0.3 |
| 6 | x0.2 |
| 5 | x0.1 |
Merge Up Slot Features
Four features drive this slot: Merge Up, Free Spins, Chance X2, and Bonus Buy. The Merge Up mechanic fires every time you land a winning cluster. Part of the cluster upgrades one level while the rest clears away, and new gems drop in. As long as fresh clusters keep forming, the cascade continues.
Free Spins trigger from 4, 5, or 6 Scatters, giving 15, 18, or 20 spins. Retriggers add 5, 8, or 10 more. During the bonus, every cell that's part of a winning cluster gets marked for the rest of the round. If a marked cell joins another win, it picks up a sticky 2x multiplier that doubles with each subsequent hit on that cell, up to 128x. Multiple boosted cells in the same cluster have their multipliers added together before payout. That stacking is where the big numbers come from.
Chance X2 costs an extra 0.25x your bet per spin and raises your odds of landing the bonus naturally. Bonus Buy costs 100x to skip straight into Free Spins, though some UK operators may have it disabled. If I'm streaming, I'd probably use Chance X2 during longer sessions and save the buy for when chat is getting restless.
Bonus Buy Options
Volatility and RTP
97.25% RTP is genuinely strong for a high-volatility slot. Free Spins trigger on average once every 276 spins, so expect dry patches. Simulations across millions of spins show the 5,000x cap has been hit during the bonus round, with base-game peaks recorded above 4,900x. Short sessions can swing hard in either direction, which is exactly what you'd expect from very high variance.
Not everyone will enjoy this volatility profile. If your bankroll can't handle 200+ dead spins between bonuses, this one will frustrate you. But that 97.25% RTP gives your balance a better cushion than most slots in this risk bracket.
