Hi there! Have you ever wondered why blobs are portrayed as smiling retards in most games?
Prepare yourself for the truth.
Controls: the WASD keys for movement. Jump on a blob to kill/absorb it, which gives you a stat boost based on what type of blob it was. To advance in each level you must first obtain a passcode from the console then make your way back to the door. In-game hints should tell you the rest.
If you really can't figure out how to beat the last level, think about the reason why you can't kill your copies. If you want me to make it more obvious here it is, you need too have no lives left before you can kill them because only when you are in danger of actually permanently dying are they in the same danger. This is the only way to beat the last level, good luck.