The last level was believed to be 19, but it actually isn't.
When you beat level 18, you will get a "YOU WIN" screen. Type this, but not in the chat: "Piesaurus". You will then be transported to level 19, the pie wonderland. You will be teleported in front of a delicious pie, but if you eat it, it will detonate. Then after you say no, you will be at the final boss - THE REAL final boss! Dodge the pie-bombs until the bombs reach the boss and detonate. After many detonations, you will win. For real.
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