The videos from https://www.trueachievements.com/xDEEVIUSx.htm
's solutions are helpful if you are stuck on a certain part or want to see the fastest possible way to complete the level but for those of you who want to keep track of what you have done and want know exactly what you need to get on your remaining levels (so you don't have to go at breakneck speeds though the whole game and hope you did it fast enough) I made a spreadsheet to keep track and calculate what the bare minimum that needs to be done. (
when I finish it will have my times on there for your reference
FINISHED! check bottom of solution for my final numbers) using simple math as stated before 40 min = 2400 seconds divide this by the number of levels and you need to finish with an average time of 2:06 (126 seconds) in every level to meet your goal. Some you can do much less but if you always beat 2:06 you will get done in time. Note:There were a few levels I finished in upwards of around 3 minuets. This is OK as long as you even it out with some runs under 1:30. My spreadsheet should help you see if you can afford to keep your 3 minuet run or not.
General strategy its a good rule of thumb to use all 3 of your save slots for each level. I usually saved the top one at the levels title screen so I always had a 0:00 starting point for that level in case things went south. then take a short burst and get as far as you can in 20-30 seconds and save. If you think you can get farther then exit and reload your first save and try to beat your last time. just keep "lunging" though the levels hard parts and alternate your saves in the 2nd and 3rd slots whenever you come to a safe area
I took the time to build this little spreadsheet to help pace myself but now you can use it too. simply put the time you completed the level in column C for the corresponding level and it will calculate the average time you need to complete each remaining level. so if you are really slow on one part but want to know how it will affect the rest of your run you can enter a high time or the time you got. The only annoying this is you have to enter the time in hh:mm:ss format so you have to type out 00:00:35 for a 35 second run. if you have any other questions just let me know.https://docs.google.com/spreadsheet/ccc?key=0AkMKQm5rxtTMdEF...
Here is what the blank sheet looks like:
Here is what it will look like as you go along and update with your times. Notice how the time remaining per level recalculates based on what you have done and what you need to do.
Here is the sheet right before I started the final zone
As you can see with these times that really are not that hard to get I still had about 9 minuets to beat the final zone which is just fighting Dr Robotnik. I just saved after every 2 hits or so. (NOTE: If you miss him a few times or get crushed or something note that the pillars have almost a pre-determined sequence so when you load it will be exactly the same as the first time you played it. This helped me a lot in that if I didn't get hits on him in 2 or 3 cycles I just reloaded the last save and got a hit on him every time because I knew where he was going to be on the next few cycles)
Here is my Final run numbers. (note: I also got chaos emeralds on Green hill 1&2, Marble 1&2, and Spring yard 1&2 just make sure you do a 10-20 second segment and save if you did well and just take it in little chunks. you should be able to get 50 rings and do the chaos ones in the same run if you want)
Final note: I'm not sure if the chaos emeralds count against your time but as there is no timer on those special stages its hard to tell. I got all of the achievements in this game on this single run though so it is possible and not too difficult.