It will be important at the end of the game to remember the starting player. Placement must happen first. The player then has the choice of mutating and then scoring, or vice-versa. After a player has placed, mutated, and scored, the turn moves to the next player. Only one piece may be placed per turn.
Mutation transforms one or more pieces adjacent to the piece that the player has just placed.
Mutation does not transform the placed piece itself. If there are no pieces adjacent to the placed piece, no mutation can occur. The largest pieces possess three points of mutation value, mediums two, and smalls one. A player must use as much mutation value as possible when mutating adjacent pieces. Mutation can be used to either change the color or the size of an adjacent piece.