Cake Mania 2: Jill's Next Adventure! (2007, PC) - Part 15 of 48: Polar Expedition, March

Having every customer give maximum tips for having five hearts full is becoming easier with the equipment upgrades, especially with cookies and TV.
Agents in black seem to have channel preferences depending on the game's venue. I just noticed that they prefer the news channel instead in Antartica, while they prefer the music channel in the waterpark.
Also check out the supplementary guide to this game:
docs.google.com/spreadsheets/...