IC4 strat, excerpt from Patashu's Guide

0) Set dimensional sacrifice autobuyer threshold to 1e30, bulk boost buy to 10, turn off all dim (NOT tickspeed) autobuyers.
1) Hold M until progress stops, then let go of M and press restart on last reset.
2) Press M 3 times. Hold 8.
3) Then press 7654321, hold 8 and sacrifice. Buy a galaxy/boost (buy galaxy if boost is equal to galaxy cost). If you can, go to step 1. If you can't, restart Step 3. (If you reach the goal, do a big crunch in the challenge.)
Or: Keep all autobuyers intact before the challenge. Start the challenge, and then let your autobuyers work to the maximum galaxy you can get to before you have to do it manually. Then, follow the original strategy as you would have done it. On a new galaxy, turn on autobuyers until you have to lose a reset, and then follow steps 2-3.