Make all Zoobies the same color. You start with 1 Zoobie (top left). Change your current Zoobies to another (pick a Zoobie on the right) and grow your group of the same Zoobies.
Daily new Calcudoku Puzzles. Like Sudoku: fill the grid where every number can only occur once per row/column. But the cages (thick bordered box) must produce the given outcome wit [...]