C9 (v9 👀)

well
i have a way to do it
do 1-8 to buy all dimensions once
then do 8-1 as many times as needed to get to next boost or galaxy
always prioritize 8th dims
tickspeed every e10 or so


another explanation: buy 1, 2, 3, 4 until you have a dim shift then 1, 2, 3, 4, 5 then another dimshift and so on, then you do 8-1 (until you get dimboosts or galaxies) after you do your 1-8 with 4 dim shifts, then repeat

in other other words, press 1234, and then pres 4 until you can buy a dimshift. then press 12345, and then 5 until you can get a dimshift. repeat until 8th dims. then, press 87654321, tickspeed, 87654321, until you can buy each dimboost. if you think you can get to a galaxy without max dimboost, go for it. each boost, start with 12345678 (you could also do shift+12345678 to not change any costs), then do 87654321, tickspeed. (the end of this strat was just assumed, might not work)

You also can watch another strategy in action with Kajfik's video guide.
https://www.youtube.com/watch?v=6o-QKHLcimU&list=PLMT2pwQbQkmvCqipx6Ybs4fyKuopmsbrm&index=2&t=0s


POST BREAK STRATEGY - EXCERPT FROM PATASHU'S GUIDE
this is for upping challenge times post 1e7 IP. Do not read on if you do not want to be spoiled.

Priority order: 1stDim/2ndDim/3rdDim/4thDim/5thDim/6thDim/7thDim/8thDim/Tickspeed

"Lastly that leaves Tickspeed Autobuyer. Use the CounterPoint00 strategy: Turn off galaxies autobuyer. Set dimboost to 0/6 (4/6 if you're a mobile user) (buys shifts but not boosts) Set 8th dimension to priority 1, 7th to priority 2, all other dimensions to 3. Set tickspeed autobuyer to singles and priority 4. Start the challenge. Count approximately 0.2-0.5 seconds after your autobuyers do the last Dimensional Shift, then hold M. Using this strategy, a time under 2 seconds is possible (I got 1.4!) This should give you a 'Power up all dimensions based on slowest challenge run' multiplier of 2000x or so. (Alternatively try these priorities: 8-1,9 for dimensions 1-8,tickspeed.)

One last thing - Your Tickspeed Challenge time is now faster than your Big Crunch Challenge time. Go back to the Big Crunch Challenge, except instead of doing 1 galaxy, automate 1 boost (11/6 on web, 5/6 on mobile) and do 1 dimensional sacrifice with good manual timing, otherwise spamming 'Max all', and it will get to the 1.3-1.4 second range."

Also, you can try out Kajfik's strategy, found in this video.
https://www.youtube.com/watch?v=GSSdHrnVgcw