What the icons of the game screen mean:
Penalty: removes a time penalty
Code: lets you enter a code when the game asks for one
Hint: asks for a hint by giving the number of the matching card, or the word given in the game. Where the author has written several, asking again gives the next one, which is more precise — and each one costs a penalty
Reset: starts the game again from zero (a new game)
Refresh: reloads the page. The time left and the score are kept