If you need to practice levels, here are all of the passwords in the game:

MOLECULE - Level 5 CALCULATOR - Level 10 EXPERIMENT - Level 15 MICROCHIP - Level 20 PROCESSOR - Level 25 MEGABYTE - Level 30 SCIENTIST - Level 35 SOFTWARE - Level 40 CIRCUITRY - Level 45 APPLICATION - Level 50 ELECTRON - Level 55 RADIATION - Level 60 DIGITIZE - Level 65 MOTHERBOARD - Level 70 PROTOCOL - Level 75 TRANSISTOR - Level 80