GameInformer - What You Can and Can't Do Offline:
https://www.gameinformer.com/2019/04/22 ... 11-offline
Offline Modes:Story Mode (Campaign)
Klassic Towers / Arcade Ladder (with no progression system / rewards given / endings can be unlocked.)
Your progression level gets reset to 0 when you go offline.
You can look at your stats (if they were downloaded) from the server first.
Online-Only:Towers of Time (Living breathing Towers w/ modifiers, progression stuff allowed, challenges, etc).
Krypt (Where you unlock extra goodies, Fatalities, Brutalities, etc).
Progression is kept server-side and online. Your level and progression returns, once you go online.