Each cell in a flipit contains a number, initially greater than zero.
This number is a counter representing the number of related cells (including the cell itself) that need to be flipped to a light green color.
In the standard puzzle type, all vertically/horizontally adjacent cells are related, in the (slightly easier) diagonal puzzle type all diagonally adjacent cells are related, in the (more difficult) third puzzle type all cells at a knight jump distance are related.
Your goal: find the unique solution and reset all counters to zero by flipping the right cells!
Tap/click a cell to flip the color and diminish all affected counters by 1. Tap/click again to mark that you think the cell should not be flipped (it will flip back to the original color, but darkened). Tap/click once more to restore it to the 'undetermined' state.
Choose a random puzzle of your preferred type below. Or use the Challenge button to try and beat someone else's best time on a (current type) puzzle they solved.