Take every tile of one colour from a factory (the rest goes to the centre), or from the centre: the first to take from the centre also gets the 1 token, which goes to the floor.
Place them on one pattern row. A row holds a single colour, which must not already be on that row of the wall. Tiles that do not fit go to the floor.
End of round: each full row moves one tile to the wall: +1 alone, otherwise +1 per tile of the horizontal line and +1 per tile of the vertical line it joins. Floor: −1 −1 −2 −2 −2 −3 −3. The 1 holder starts the next round.
End of game: after the round in which a wall row is complete. Bonus +2 per complete row, +7 per complete column, +10 per colour placed 5 times. Tie: most complete rows.
Tap a tile, then the row. Left of each row: its fill after the move, and the floor penalty. ● = changed since your last move.