How about we also write down our progress in the same format? For easier reading and comprehension and all that. Maybe something like this?

#1: Iggy's Castle completed at:
#2: Morton's Castle completed at:
#3: Lemmy's Castle or Vanilla Fortress completed at:
#4: Ludwig's Castle completed at:
#5: Roy's Castle completed at:
#6: Wendy's Castle completed at:
#7: Larry's Castle or Valley Fortress completed at:
#8: Super Mario World completed at:

checkpoint 3 and 7 have multiple routes, so just pick whichever applies there. Also since we're in different timezones, instead of writing how much the clock is, it might be better to write how much time you've spent gaming up until that point.