The Tube Tray

The Tube Tray shows you the tubes available for the current experiment. If there is more than one tube of a particular type, there will be a green number above the tube showing you how many of that type of tubes are in the tray. Click on a tube in the tray with the left mouse button to pick it up.

(Hint: You can pick up more than one tube of a certain type by repeatedly clicking on that type of tube. The mouse cursor will show the type of tube you are carrying, and a green number will appear next to the tube showing you how many of that type of tube you are carrying. You can drop all the tubes you are carrying by clicking in the Tube Tray or by right clicking the mouse in the game window.)