I made it to around level 50 in the first day and then had it on auto spin on minimum 5 million bet on the scarecrow slot which seemed to have the best luck for me. This was also with the introductory 48 hour fire xp, without this I likely wouldn’t have completed the offer. Just adding my experience with this offer and glad to hear the OP was able to complete it on time! I just finished this offer in a day and a half, but had to grind out the very last level after running out of coins 90% of the way through level 99 (game pends at level 100).
