I got these from Digital Press: 
HIDDEN MESSAGE: On level 3, move between two forest screens very quickly. The screen will freeze, the score will disappear, and 3 green initials will appear in the corner of the playfield! {David Feldman}
HIDDEN MESSAGE: On level 4, move between two forest screens very quickly and you’ll receive over 900,000 (919,500?) points, and 2 initials! {David Feldman}
SMURFETTE: Stand next to Smurfette and let your energy run out. When it does, she will knock you down!
DRESS: Leave the last screen (with Smurfette) and her dress will disappear! Also stand on skull and use either a roller controller or 2 joysticks (with a Y adapter)- push one UP and the other DOWN.
DIFFICULTY: If you reach a difficult screen, return to the previous one and then return. By repeating this, the screen will most likely become easier.
Our Smurf videogame section has lots more Smurf ColecoVision cheats/info.
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