Tile Workshop
Use the gap, find the shortest route.
2–5 min · Play freeCrystal Field — Mine Logic Puzzle
Genre: Mine Logic Puzzle
Don’t guess; read the clues.
How to play Crystal Field
You try to open the safe squares without touching the crystals. Crystal Field has 18 levels: the first 6 fields are 6×6, the next 12 are 7×7, and the number of crystals rises from 5 to 13.
An 18-level crystal field plus a Daily field: on grids growing from 6×6 to 7×7, read the numbers around hidden crystals and open every safe square. Each board is generated and verified to be solvable by logic alone after the first tap, so no guessing is needed. When the flags around an open number are complete, tapping it opens its neighbors at once. Safe scan helps when you’re stuck but costs a star; in the first 3 levels, a shield forgives one mistake.
Step by step
- The first square you dig and the 8 squares around it are always safe. Crystals are placed after that first tap, and the timer starts at that moment.
- Each number tells you how many crystals are in the 8 squares around it. Long-press a square you know holds a crystal to place a ⚑; on a keyboard, select with the arrow keys and dig with Space.
- Tap a number whose flags are complete and the remaining squares around it open together. Touching a crystal ends the level; in the first 3 levels, a shield forgives one mistake.
- When you’re stuck, the Scan button opens a safe square but costs a star. Finish without scanning and within the time target for 3 stars.
Tips
- If a number has exactly as many closed squares around it as its value, they’re all crystals; flag them.
- Read 2 neighboring numbers together: if one’s closed squares are all inside the other’s, the difference between the numbers is the number of crystals in the squares outside.
How to play mine logic puzzles: reading the numbers
Game facts
- Round length
- 2–5 min
- Computer
- Pick a square with the arrow keys and dig with Space. Press the down arrow from the bottom row to reach Flag mode, Safe scan and Undo.
- Phone
- Tap a square to dig, long-press to place a flag; Flag mode, scan and Undo are at the bottom. Tap an open number to open its neighbors.
- Date added
- Version
- 1.0.4
On every device: phone and computer, portrait or landscape
Frequently asked questions
Can I play Crystal Field on my phone?
Yes. On your phone: Tap a square to dig, long-press to place a flag; Flag mode, scan and Undo are at the bottom. Tap an open number to open its neighbors.
How do I play Crystal Field on a computer?
Pick a square with the arrow keys and dig with Space. Press the down arrow from the bottom row to reach Flag mode, Safe scan and Undo.
Is Crystal Field free?
Yes. Crystal Field is free to play in your browser; no download, account or in-app purchase is needed.
How long is a round of Crystal Field?
Round length: 2–5 min.
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