If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The pub is open with different types of alcoholic drinks. You'll have to make the Boozer drink the stuff within the time duration (2mins) and also prevent him from falling down.
Use Left and Right Arrow to Balance.
Use shift key to pour the alcohol from bottle to glass.
Use Space bar to make him drink the alcohol which gets poured into the glass