I feel like i need a manual save button, just to hit it a few times before i leave. You know to make sure. Just hit it like 3 times maybe 10 you never know
The easiest way to check it - just go offline for some time. But Yes! the game have offline rewards. But you have the choise either accept or decline them, because some challenges should be finished as fast as possible.
 "Idle Hero Defense"){kind=icon}
 "Recycle Idle"){kind=icon}
 "Scream Collector"){kind=icon}
 "Get A Little Gold"){kind=icon}
 "IdleVenture"){kind=icon}
 "Explorer's Short-cut"){kind=icon}
 "undefeated spider"){kind=icon}
 "Zombidle"){kind=icon}
The easiest way to check it - just go offline for some time. But Yes! the game have offline rewards. But you have the choise either accept or decline them, because some challenges should be finished as fast as possible.