You are only allowed to complete it once, meaning that your final score is calculated after finishing the 28 levels the first time.
If you complete the 28 levels once, add 1000 points to your final score for each live you have left. If you don't loop the game, just enter your final score.
IMPORTANT: We use the same snapshot that was used in the Speccy Tour 2004. So if you competed in the ST back then, then you can upload your recording here.