Ta da! All 123 levels complete! Not only that, but I went back and made sure I had beaten the target scores and par times on those I’d missed, and now I’m ranked 34th in the world. Excellent! That netted me two more achievements too, which was nice.
Slightly less ace news on the Marsho Madness front though – I’ve dropped quite a few places in the rankings (although am still top of my friends leaderboard) and failed to improve on my best score today. Pah.