Mr. Logic's "4-Digit Puzzles"

[Mr. Logic]

This game consists of a series of levels, each of which contains a different "secret rule" by which a given 4-digit number changes into another 4-digit number. As a clue to help you guess what the secret rule is, you will be shown an example of how one particular 4-digit number changes.

The object of the game is to try and reach level 21. If you get there, you will be given a secret password. If you are one of the first ten players to email that password to Mr. Logic, your name will be added to the game's Top Ten List.

Click here to download

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WARNING:
USE SPOILER TAGS TO GIVE HINTS.
DO NOT GIVE SOLUTIONS, POST FULL QUESTIONS, OR GIVE A LINK TO ANY PART OF THE GAME.

THIS IS HOW YOU MAKE SPOILERS
[spoiler=Title Here]Enter text here...[/spoiler]