B/W converts every terrain and unit color to the same grey it would print as — the background switches to paper white while it's on.
Click a player, then click a hex to place a unit; click the same player on that hex again to stack more (up to 9). Fortified stacks get a ringed base in both views.
Painted tiles outside the new size are dropped; everything else is kept.
Rings the map with your lowest terrain (ocean), then rises gradually toward a random interior peak.
Terrain mode: click a terrain, then click (or drag across) hexes to paint; the eraser clears a tile. Units mode: click a player, then click hexes to place or stack their units. Height and color live on the terrain or player, not the tile — edit one and every tile using it updates.