As a Thought Police Bureau officer, monitor and eradicate subversive color-coded ideas.

Author Comments:

My apologies to color-blind people ;)
It's my first game in Flash, written in AS3, entirely done with free software (FlashDevelop 3, audacity, Inkscape & Gimp)
Be sure to read and understand the rules before assuming the game is bugged. English isn't my primary language, so I may be guilty of not having made the instructions clear enough in-game.
I'll try a longer and better explanation here.
Words appearing in the lower part of the screen, when they are not underlined, spell the name of the color you have to click to eliminate them (and the color they're decorated with is unimportant). On the other hand, when they are underlined, you have to disregard their meaning and act according to their own color, e.g you must click on the red square to eliminate an underlined "Blue" written in red.
When you reach level 5, words start appearing on the upper screen. There the rules are the opposite than at the lower screen, so you have to act according to the spelling of underlined words and the decoration/own color of non-underlined words.
At level 8, two red lamps may light. While they are on, all rules are inverted, so you would have to click on the blue square to wipe an underlined "Blue" written in red if it's in the lower screen.