The game contains several useful items that you can use, they appear on the right side of the game page.
The sword - eliminates a random pair of tiles.
The Telescope - gives a hint about a pair of tiles to remove.
Shuffle - shuffle all the tiles on the board.
The Sandglass - adds 8 seconds to the countdown.
The Canon - eliminates two random pairs of tiles.
After you complete the level, a screen will appear with the password printed. Note that you can write down this password, quit the game, and resume at any time by entering this password on the main screen.