Since Roll's method of timing is the combined IGT of each level, you don't lose time in menuing or in-between levels. Could you play the levels in a world, or full game run, in a different order than 1-2-3-4-5? As far as I can tell, the rules don't mention an order in which you have to play them. You would just have to return to the level select after beating a level out of order to select the previous level(s) you haven't beaten, which wouldn't lose time due to using IGT. In most worlds the fifth level is the hardest and least consistent, at least for me, so I thought of starting with the 5th level and then once I get a good completion time completing the rest of the levels in the world. Is this allowed? Should it be? Fast Foodies, which is the only other category which I could imagine this could also be done, has a rule which specifically says you must complete Juice Hut before Sarepia Theater.