Very good set of cases so far. Case 3 being noticeably harder than the first two was a nice spike in difficulty and possibly a sign of the baseline of difficulty for things to come? The pattern of setting something up in passing in one case, and it paying off in the next is also a fun bit of storytelling that works well.
I would say I can't wait for the next case to be finished or teased, but I can certainly keep my patience if it means more quality cases like these. Keep it up!