Let's get the most obvious one out of the way: Play fairly.
It's more fun when the whole game isn't spoiled.
Besides, there aren't even any cheats for this game!
All answers are in lowercase [unless specified].
Levels with search bars will require you to search the web for an answer.
However, at around level 60, they will stop appearing altogether, so make sure you use your intuition.
Back up a bit and go over the clues again if you think you're overthinking it.
Some answers [that AREN'T UN/PW levels] have 2 (or more) words (they will appear around phase 3),
so make sure you type them correctly. No other marks/spaces.
Look for hints EVERYWHERE on the page and try to interpret them.
One more thing... Never give up.
Some levels are pretty #$@*ing hard, but every single one is completely solvable in some way.
Good luck, and happy riddling!