Click on given number to start selecting neighboring cells by clicking. Groups have to have the same number of cells as the given number.

The groups have to be orthogonally connected, not diagonally.

There can be no, one or more givens per group. 2 groups of same size, can not connect orthogonally.

Grid keeps track of the given number (location) you clicked. So 2 groups of 3 have a different value behind the "scene"...

Note: For now extra givens have to be fused to the group.