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No borders
A flat board has safe-ish walls and corners. A cube has none: every edge tile is fully surrounded, which removes the cheap edge guesses players lean on.
No. 01 — Solo field live seed
Six faces, one block decides.
A minesweeper you can turn in your hands. Numbers count mines across the cube's edges, and every board is dealt from a live Solana blockhash, so the layout was fixed before you touched it.
CA
- Mines left
- —
- Time
- 0.0
- Geodes
- —
- Dig risk
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Fetching the latest block…
Cleared
Your browser could not start WebGL, so the 3D cube is unavailable. The verifier below still derives and draws any board as an unfolded net.
02
Reading the cube
Classic minesweeper logic, folded over a solid. The new skill is seeing around corners.
Dig
Click a tile. If it is safe it sinks and shows how many mines touch it. A zero opens its whole neighbourhood for you.
Numbers wrap the edges
A tile on an edge also touches the three tiles across the fold. Corner tiles touch seven, everyone else eight.
Flag and chord
Right-click or long-press to flag. Click a number whose flags are all placed and its other neighbours open at once.
Geodes
A few safe tiles hold a geode, always beside at least one mine. Each is worth ten points: bravery, priced.
A fair opening
The board names its own opening tile, so nobody starts blind and nobody gets a hand-picked start.
Interlude — the net
Open the cube flat.
- i.
Six faces, one surface. Every tile has neighbours on all sides, so there is no wall to lean on.
- ii.
Cut seven edges. Four faces swing open on hinges they share with the front face; the back rides out on the east.
- iii.
One flat net. The verifier below draws exactly this layout, mine for mine, from the same blockhash.
03
Dealt by the chain, not by us
When you deal, the page asks Solana for its latest finalised blockhash. That 32-byte value is unpredictable before the block exists and public forever after. Everything else is arithmetic you can repeat.
The recipe, exactly
seed = SHA-256("cubefield/v1|" + slot + "|" + blockhash
+ "|" + n + "|" + mines)
words = SHA-256(seed ‖ u32be(0)), SHA-256(seed ‖ u32be(1)), …
read as big-endian uint32, rejection-sampled
order = Fisher–Yates over tile indices 0 … 6n²−1
mines = order[0 … mines−1]
geodes= next tiles in order that touch ≥ 1 mine
start = next tile in order with zero mine-neighbours
tile = face·n² + row·n + col faces: E W T B N SThe blockhash for any slot can be read on any Solana explorer or with getBlock. The verifier below does exactly that.
Entropy feed
connecting- Throughput
- —
- Epoch
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- Epoch progress
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Live from Solana mainnet through this site's read-only RPC relay. Pick any row to play that exact block.
04
Re-derive any board
Enter a slot. The verifier fetches that block's hash from the chain, runs the recipe in your browser with WebCrypto, and draws every mine.
Enter a slot to fill this net with its mines.
- Fingerprint
- —
- Matches your game
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- 3BV
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- Mines per face
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- Seed (SHA-256)
—
- Mine
- Geode
- Opening tile
05
Your ledger of runs
Stored only in this browser. Every row keeps its slot and blockhash, so a time you are proud of comes with the means to check it.
| # | Result | Board | Time | Score | 3BV/s | Slot | Verify |
|---|---|---|---|---|---|---|---|
| No runs yet. Clear a board and it lands here. | |||||||
0runs
0cleared
—best standard
0geodes found
06
Odds lab
Exact numbers for any cube, computed from the real neighbour graph with log-space binomials, not estimates.
- Surface tiles
- —
- Mines
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- Blind first dig hits a mine
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- Expected zero tiles
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- Average neighbours
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- Edge + corner tiles
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07
If digs cost something: a model
Cubefield is free. Shared-cube games elsewhere charge per dig, raise the price as a round goes on, and split the take between a reward pool and a burn. This model shows how those levers interact so you can judge any such design before you pay into one.
Model only. No token, no deposits, no payouts exist here.
- Total digs
- —
- First / last dig
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- Total spent
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- To reward pool
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- Burned
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- Geode hit rate per safe dig
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- Break-even payout per geode
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Hit rate uses the Standard cube's real geode-to-safe-tile ratio. Break-even is the average cost of a dig divided by that rate: the payout a geode must carry for an average dig to return its cost, before mines end your round.
08
Why a cube plays differently
7 / 8
Two neighbourhoods
Only the 24 corner tiles have seven neighbours. Everything else has eight. Learn to spot the corners and you read faster.
6n²
Scale on demand
Small, Standard and Deep run 150, 294 and 486 tiles. Density stays near one in seven so skill transfers between sizes.
09
Questions
Is this connected to a wallet or a token?
No. Cubefield is a free single-player game. It never asks for a wallet, never signs anything and never moves funds. The only network calls are read-only requests for public Solana data.
What does “provably fair” mean here?
The mine layout is a pure function of a public blockhash and the board size. We cannot choose the blockhash, and once it exists anyone can recompute the layout. The verifier does this independently of the game code's state.
Could someone pick a block that gives an easy board?
The deal button always takes the newest finalised block at that moment. You can choose an older slot in the entropy feed, which is fine for practice, but leaderboard runs record their slot so anyone can see which block was played.
Why is there an opening tile?
Classic minesweeper protects your first click by moving a mine, which would make the layout depend on your click. Here the board itself names a zero tile to open, so the layout stays fixed and checkable.
Is the leaderboard global?
No. It is stored in your browser's local storage and never leaves your device. Clearing site data removes it.
What are the economy numbers?
A labelled model of how pay-per-dig designs work. Nothing in it is live, and no tokens or rewards exist on this site.
Does it work on a phone?
Yes. Drag to turn the cube, tap to dig, long-press or switch on Flag mode to flag. If WebGL is unavailable, the verifier still draws any board as a flat net.