Hubbard
How to play Colour Fields
- Fill every cell green (triangle) or blue (circle). Numbered cells have fixed colours.
- A field is a group of the same colour joined across edges. Its number gives its exact cell count, including the numbered cell.
- Every field must contain exactly one number. Two clues of the same colour cannot join into one field.
- Corners do not connect fields. Both colours can form several separate fields, and solid 2 by 2 blocks are allowed.
- Tap to cycle green, blue and clear. Hold and drag to paint one colour, or choose Green, Blue or Erase. Undo reverses one tap or drag; Reset clears your marks. Neither resets the timer.
- The board finishes automatically when every field is correct. Arrow keys move, Space cycles, G marks green, B marks blue and Delete clears.
Your first useful move
A field that has reached its clue number cannot grow. Its edge neighbours must be the opposite colour, which can force the next field to take shape.
Playing on HubbardGames
Open a Library board to find this game’s controls. The how-to-play button keeps the rules close by while you solve, so you can check a detail without leaving the puzzle.
Choose your difficulty
The Library shows the available difficulty levels for this game. Choose a board that suits you, then return for another when you want more practice.
Can I practise without affecting the league?
Yes. Choose a puzzle from the Library to practise this game. Library practice does not add league points. You can return to an unfinished puzzle later.
