Here is the solution for the Chemistry Lab level: From the starting screen, head left and trip the switch that you find there. This turns off some of the deadly electrical devices and allows you to enter a previously inaccessible screen. Go up the ladder and walk to the left, then use the conveyor belt to fall down and collect the crowbar. Next make your way to the auto ladder. Use the crowbar and jump on the lever three times. Go up and collect the jam jar, before returning down and heading right to where the other jar is. Go down two levels and head right. Use the jam jars, and you will be able to read the tiny password and pass through the locked door. Go right. Collect the hammer and take it up to the top level. Head left and collect the phial (there's a clue about a "strong aroma"), and head down to where the 'test your strength' machine is. Use the potion and the hammer and you will ring the bell, revealing an oil can as your prize. Take this up to the top-right hand screen and use it on the pipe and, voila, you have completed the level!