OsmotissimoDuo is the duel version of Osmotissimax (two players on one tablet).
You must, in turn, find hidden words in a grid. Each found word is colored orange or green for a player to another player. The purpose and to color the grid to pass to the second round of the grid.
The second run is to change a letter of the grid to form new words.
To move to the next screen, you have to color the entire grid in the first race. It is not mandatory to fully color in the second inning to change grid but there is a bonus to the key: the score of the second round is doubled.
As Osmotissimax, each grid is unique, randomly generated from a dictionary of over 280,820 words (ODS7).