Press G for the vial of the liquid to appear. Press S to make it go away. Click while the vial is there and put the drops on the Toys. Click on the Toys and they will do stuff. Beware, the liquid will last for only 10 seconds!
Besides the Vial, the drop of Liquid and my logo, everything was by the Scratch library. Thank you Scratch, and a special thanks to the players of my game!