The father of shooters comes to flash. Hit escape, select single player, then new game. You are then presented with 3 pathways. From left to right they range from easy, normal, and hard difficulties. After you pick your difficulty and enter the portal, you are presented with a new room with 4 pathways. You MUST choose the far left path. This takes you to the levels that are only available in the shareware version of Quake. All other pathways will do nothing. Adjust controls in game, or use default of arrow keys and WASD to control your movement, Control to fire, and space to jump.