Based on where I am up to in Rodd and Todd I am going to do it this way: Bart isn't needed after 13, and kids arent needed until 22A
10. Reach Level 21 and Build Krustyland Burger (24 hours) (Homer, Bart, and Milhouse needed next) Set up golf tournament
11a. Make Homer Eat at Krustyland Burger (30 min)
11b. Make Bart Ride the Death Drop (30 min)
11c. Make Milhouse Eat at Krustyland Burger (30 min) (Martin needed next)
12a. Place the Knock Over the Fuzzy Guy Stall 12b. Make Martin Try to Knock Over the Fuzzy Guy (60 min) (Bart needed next, for dialogue)
13. Reach Level 22 and Build Sleeping Itchy's Castle (24 hours) (Krusty needed next) (Bart, Rodd and Nelson mini golf)
14. Make Krusty Get Serious (8 hours) (Homer needed next15. Place Sideshow You (Comic Book Guy needed next) ) (Todd, Lisa Martin Mini Golf)
16. Reach Level 23 and Build the Gift Shop (24 hours) ([Krusty and Comic Book Guy needed next) (Bart Rodd and Todd Minigolf
The Wolfcastle quests that I have remaining aren't affected by Krustyland (Relax in his Mansion, Exercise and shoot action Footage)
I wonder when the level updates are going to contain: A springfield building, a squidport building, a krustyland building, some decorations and maybe 2 premium items
edit: wrong times bart needed for prompting a building
