What Roobet publishes about Mines
Mines is a Roobet house game. Roobet's game page gives it a price in so many words: "It's a game of chance with a 96% RTP and a maximum multiplier payout of $3,000,000", and "the house edge is 4%, which is the mathematical advantage built into the multipliers by the platform" (Roobet Mines game page, 1 Nov 2026). The page and the verifier also show something most Mines games lack: a choice of board size.
| Item | What Roobet states | Where |
|---|---|---|
| RTP / house edge | 96% RTP, 4% house edge | Mines game page (1 Nov 2026) |
| Maximum payout | $3,000,000 | Mines game page (1 Nov 2026) |
| Grid sizes | 25, 36, 49 or 64 tiles | Mines game page (1 Nov 2026) and Mines verifier (12 Nov 2026) |
| Mines per round | Presets of 1, 3, 5 and 10, or a custom number; at most "one less than the number of tiles" | Mines game page (1 Nov 2026) |
| Worked example | 25 tiles with 24 mines: the one safe tile pays 24x | Mines game page (1 Nov 2026) |
| Cash-out | "You can cash out at any time after selecting a tile, but if you hit a bomb, you lose the game." | Help centre, "Roobet House Games" (12 Nov 2026) |
| Autobet | Tiles are chosen in advance and "played out at the same time" | Help centre, "Autobet" (12 Nov 2026) |
| Fairness | Server seed, client seed and nonce; HMAC-SHA512, then a seeded shuffle of the tiles | Fairness page and Mines verifier (12 Nov 2026) |
Roobet's own example confirms the pricing rule. With 24 mines on 25 tiles the single safe tile is found 1 time in 25, so a fair payout would be 25x. Roobet pays 24x, which is 25 times 0.96.
Four board sizes
The verifier takes a grid size as an input and accepts exactly four: 25, 36, 49 and 64 tiles. It also caps the mine count for each at one less than the tile count: 24, 35, 48 and 63. A larger board with the same number of mines is a gentler game per pick, and a larger board filled to the limit is a longer shot than a 25-tile board can offer.
| Grid | Tiles | Most mines allowed | One safe tile left: chance | One safe tile left: pays at 96% |
|---|---|---|---|---|
| 5 by 5 | 25 | 24 | 1 in 25 | 24.00x |
| 6 by 6 | 36 | 35 | 1 in 36 | 34.56x |
| 7 by 7 | 49 | 48 | 1 in 49 | 47.04x |
| 8 by 8 | 64 | 63 | 1 in 64 | 61.44x |
Grid sizes and mine limits: Roobet Mines verifier, 12 Nov 2026. Payouts are arithmetic from the stated 96% RTP and match Roobet’s own 24x example for the 25-tile board.
What a 4% edge does to the multiplier ladder
If every step is priced at the stated 96%, the multiplier after k safe picks with m mines on N tiles is 0.96 times the fair odds:
multiplier(N, m, k) = 0.96 × C(N, k) / C(N−m, k)
The same game at Stake and Shuffle uses 0.99 in place of 0.96. The table sets the two side by side on the 25-tile board.
| Mines (25 tiles) | First pick safe | After 1 pick at 96% | Same step at 99% | After 3 picks at 96% | Same step at 99% |
|---|---|---|---|---|---|
| 1 | 96% | 1.0000x | 1.0312x | 1.0909x | 1.1250x |
| 3 | 88% | 1.0909x | 1.1250x | 1.4338x | 1.4786x |
| 5 | 80% | 1.2000x | 1.2375x | 1.9368x | 1.9974x |
| 10 | 60% | 1.6000x | 1.6500x | 4.8527x | 5.0044x |
| 24 | 4% | 24.0000x | 24.7500x | n/a | n/a |
Arithmetic from the stated RTP figures: 96% for Roobet, 99% for Stake and Shuffle. Displayed multipliers are rounded to two decimals, so individual steps on screen can sit slightly either side of these values.
Two things stand out. With one mine, the first safe pick at 96% pays exactly 1.00x: the 4% edge cancels the whole reward for a 24-in-25 chance, and it takes a second safe pick to be ahead at all. And every figure in the Roobet columns is about 3% lower than its neighbour, at the same risk of hitting a mine. Over money wagered that is $40 per $1,000 at Roobet against $10 at the 99% sites, four times the cost for the same game.
On the larger boards the effect on early picks is stronger. With one mine on 64 tiles the fair odds of a single safe pick are 64/63, about 1.016x, and 96% of that is below 1x. The first picks on a big, lightly mined board are priced at or under the stake, and the multiplier only pulls clear after several safe tiles.
How the board is fixed and verified
Roobet's fairness page describes the seed-pair model in three ingredients: a server seed "provided by us" and shown as an "encrypted hash" before you play, a client seed "which can be changed before any bet", and a nonce that "increments by 1" after each bet. The Mines verifier linked from that page shows the exact computation:
- One hash per bet. HMAC-SHA512 with the server seed as key over the text
clientSeed - nonce, with a space, a hyphen and a space between the two. - Numbers from the hash. That hash is run through HMAC-SHA256 with a counter (0, 1, 2 and so on) as the key. Each output is cut into four-byte groups and each group becomes a number between 0 and 1. The counter advances until there is one number per tile.
- A shuffle. The tiles, numbered from 0, are shuffled with the Fisher-Yates-Durstenfeld method using those numbers in place of a random-number call. The code comment reads: "This ensures provably fair."
- Mines first. The first tiles in the shuffled order are mines, as many as your mine count, and the rest are diamonds.
hash = HMAC-SHA512(key = serverSeed, message = clientSeed + " - " + nonce)
numbers = 4-byte groups of HMAC-SHA256(key = "0", "1", …, message = hash)
order = Fisher-Yates shuffle of tiles 0 … N−1 using those numbers
mines = first m tiles of order
The whole order exists before the first click, so picks cannot move a mine. Roobet's Autobet article makes the same point from the player's side: in Mines "all of your tiles are played out at the same time so the order you click them in does not matter".
To check a round, Roobet's fairness page lists what happens when you verify: "We reveal the Server Seed of which we gave you an encrypted hash of", the outcome is regenerated, and "Your Nonce gets reset" and "Your Server Seed gets reset". Then:
- Commitment: "You can take a SHA256 of the revealed server seed and make sure that it equals what we gave you as the encrypted hash." Our Roobet seed checker does this step in your browser.
- Board: open the Mines verifier from the fairness page ("Verify Results") and enter the revealed server seed, your client seed, the bet's nonce, the mine count and the grid size. It lists every tile as mine or diamond.
- What our tools do not do: the Mines verifier on this site reproduces Stake and Shuffle boards. Roobet's construction is different, so for Roobet it runs the commitment check only and the board has to come from Roobet's verifier.
Background on what such a check proves: what provably fair gambling proves and the general verifier.
Roobet Mines against Stake, Shuffle and Gamdom
| Roobet | Stake | Shuffle | Gamdom | |
|---|---|---|---|---|
| Stated return | 96% RTP | 99.00% RTP | 99% RTP | 99% after the first $5,000 of daily Originals wagering |
| Cost per $1,000 wagered | $40 | $10 | $10 | $10 once the daily allowance is used |
| Grid | 25, 36, 49 or 64 tiles | 25 tiles | 25 tiles | 25 tiles |
| Mines | 1 to one less than the tile count | 1 to 24 | 1 to 24 | 1 to 24 |
| First safe pick, 1 mine, 25 tiles | 1.00x | 1.03x | 1.03x | 1.03x at a 99% price |
| Stated ceiling | $3,000,000 maximum payout | Profit cap per coin, e.g. 2,500,000 USDT | $500,000 per round | Shown in the bet panel |
| Our checker | Commitment only | Full board | Full board | Not covered |
Stake: game page and fairness documentation 1 Nov 2026, help centre 12 Nov 2026. Shuffle: game page and help centre, 12 Nov 2026. Gamdom: game page 1 Nov 2026.
Roobet offers something the others do not, the larger boards, and charges for the game at four times their rate. A player who only wants the 25-tile game pays less for it at any of the other three.
Sources: Roobet Mines game page (1 Nov 2026); Roobet fairness page and the Mines verifier it links (12 Nov 2026); Roobet help centre, Roobet House Games and Autobet (12 Nov 2026). Multipliers and costs are our arithmetic from the stated RTP figures.
For the odds of each step use the Mines calculator. Roobet's licence, KYC and withdrawal terms are in the Roobet review.