Easy
- It's a picnic! A small minefield to start with.
    *Tiles: 8x8
    *Mines: 10

Medium
- You're in the middle range! Stay alert!
    *Tiles: 12x12
    *Mines: 20

Hard
- Hold onto your hat! You're stepping into the minefield...
    *Tiles: 16x16
    *Mines: 40