Kaskade 2 is in the puzzle games section of kadokado. It is a true strategy game in the sense that there is no time limit and you are completely in charge of each move that you make. The object of the game is to clear large patches of the same color (red, green, or blue), which will then be replaced by random blocks. Kaskade 2 is one of my favorite kadokado games, and it is free.
In order to clear a patch there must be at least two blocks touching each other.
Now, if you want to get a high score you must create HUGE patches of the same color by eliminating smaller patches to bring the big chunks together. Even adding one or two blocks to a patch improves your score tremendously. If possible you want to get every single block of a one color linked together so that when you click it you eliminate all of the blocks of that color. This also increases your chance of getting a lot of blocks of another color to come in together.