Upcoming Slot Releases This Week – New Online Slots (June 15 – June 21)

Two games to open the week, and they're pulling in opposite directions.

Pragmatic Play returns to its Mahjong Wins range with a three-pot twist, a familiar tumble-multiplier engine carrying a 97% RTP and a 100,000x ceiling that sits among the most aggressive numbers of the month. Hacksaw Gaming goes the other way entirely, setting aside the conceptual themes they're known for in favour of full Vegas glitz: chrome reels, flashing lights, and one sharp multiplier mechanic doing all the work.

One reaches for the sky. The other keeps things tight and close to the ground.

Check out this week's new online slots — full details on RTP, volatility, max wins, and bonus features for every game releasing between June 15 and June 21.

Mahjong Wins Triple Pot (Pragmatic Play)

Release date: June 18

Mahjong Wins Triple Pot is exactly what the title promises, the established Mahjong Wins formula moved into three-pot territory. The visual language carries over directly from earlier entries in the range: golden dragons coiling around the reels, mahjong tiles, warm reds and gold, coins spilling across the background. It's familiar to anyone who's played the series, and it doesn't pretend to be reinventing itself.

What it keeps is the part that always worked, a tumble system with escalating multipliers. Winning symbols clear, new ones drop, and the multiplier climbs through 2x, 3x, and 5x across consecutive tumbles before holding at 5x. In free spins it goes further, running 2x, 4x, 6x, 10x and staying there. Gold-marked symbols transform into wilds for the next tumble, keeping chains alive longer than they'd otherwise run.

The three-pot mechanic is the new layer. Bonus Coins worth anywhere from 10x to a staggering 100,000x collect into blue, red, and purple pots tied to the three middle reels. When they trigger free spins, those collected values pay out, and the associated reels become active, every symbol landing on them highlighted in gold. Activate all three reels and the board is fully loaded.

The standout number here is the 97% RTP, which is genuinely high, paired with a 100,000x max win multiplier that puts this among the most aggressive max wins of any Pragmatic Play releases. Medium volatility keeps it from being punishing, but make no mistake, the top end is the whole point.

Dandy Diamonds (Hacksaw Gaming)

Release date: June 18

Dandy Diamonds is Hacksaw Gaming setting aside the conceptual themes they're known for and going full Vegas. No lore, no introspection, just chrome reels, glowing pinks and purples, and a jazzy soundtrack doing exactly what you'd expect. Diamonds, crowns, cherries, dice, the whole old-school fruit machine vocabulary. It's deliberately surface-level, and whether that lands depends entirely on whether retro glitz is your thing.

The mechanical core is the Diamond symbol, which does double duty. It's wild, it carries an additive multiplier of 2x to 100x, and every time one lands it triggers a Dandy Respin hold-and-win sequence. When several Diamonds share a win, their multipliers add together before applying. Land four or more in a square and they merge into a Colossal Diamond, pooling all their multiplier values, and that Colossal can keep growing if more Diamonds land around it.

The Bolt symbols are what makes this slot game special. A Bolt activates inside a 3x3 area around a Diamond and bumps the multipliers there by an additive 2x to 20x before wins resolve. The Epic Bolt goes wider, boosting every Diamond on the grid at once. Only one of each can land per spin, but when they connect with a loaded Colossal Diamond, the math jumps.

Three bonus tiers escalate things, with Ice and Shine dropping a 3x3 Colossal Diamond on the very first free spin. At 96.33% RTP, medium volatility, and a 5,000x ceiling, Dandy Diamonds isn't chasing the high-end numbers some of this week’s releases are, it's a tighter, flashier experience built around one strong mechanic.

Mahjong Wins Triple Pot takes it this week.

The tumble-multiplier engine has been the backbone of this series for a reason, and dropping the three-pot collection system on top of it gives the bonus round a structure that actually builds toward something. Bonus Coins worth up to 100,000x feeding into pots, reels activating one by one, gold highlights spreading across the board as the round progresses, it escalates in a way that rewards staying in.

Then there are the numbers. A 97% RTP is genuinely high for a slot with this kind of winning potential. Medium volatility keeps it accessible rather than brutal, which is a rare combination at this top end.

It's not the most original game of the week. It doesn't need to be. It takes a formula that already worked and gives it more room to run.

The two games this week sit at opposite ends of the same shelf. Mahjong Wins Triple Pot is patient by design, the pots fill, the reels switch on one at a time, the multipliers compound, and somewhere up at 100,000x there's a reason to keep watching. It rewards the players who don't bail early. Dandy Diamonds has no interest in that kind of waiting. A Diamond lands, a Bolt fires, the multipliers add up, and you know within a spin or two whether the board is going to do anything. Its 5,000x ceiling isn't trying to compete on size, it's trying to get there faster.

Stay in and let it build, or find out quickly and move on. That's the choice this week hands you.