The aim of the game is to match pairs of identical tiles and remove them from the board, revealing the tiles underneath (and making them available for play). The game is completed when every pair of tiles has been taken from the board. The only rule is that you cannot select a tile that has a tile on both sides (left and right).
To be simple: combine 2 of the same free tiles to remove them from the game. Free tiles are highlighted. You can combine any flower tile with another flower tile, the same applies to the season tiles.