Click the board to allow Zillions to drop nine square tiles.
Each tile carries three different colours, each colour associated with one or two sides of the tile. (The set of 9 tiles covers all possible combinations).

Your task is to turn and exchange tiles until the sides of adjacent tiles show the same colour.
To turn a tile, click it and drop it on the same place.

Variant 2: Here the colour-matching condition also applies to the board in a wrap-around sense: the colour at the left border must be identical to the colour at the right border, and the colour at the top border must be identical to the colour at the bottom border.
Variant 3 and 4: no adjacent colours are allowed to match.

 
The game is based on the 3-dimensional game 'On The Level' by Harry Nelson, whom I have learned a lot from.
Harry was editor of the Journal of Recreational Mathematics for several years. He is a part-time puzzle collector and puzzle inventor. He is also a co-founder of the International Puzzle Party, a yearly convention of puzzlists.
While he worked for the Lawrence Livermore Laboratory, he helped using their Cray supercomputers to win the Computer Chess Championship in Cologne in 1985 (?).

More freeware and real puzzles and games at my homepage: karl.kiwi.gen.nz.