They're pulling the plug entirely in April, and that means no offline version, either. We knew that the game couldn't last forever. The population had been dwindling, as had the company's attentiveness to fixing problems. And if nothing else, Adobe is pulling the plug on Flash entirely in 2020.

I've generally been making a few hundred koban per day by killing opponents in the daily world bosses. If you don't already have a strong team, however, that's unavailable to you, as you won't be able to finish off opponents before someone else does.

They ended koban sales because they didn't want people to buy a bunch of koban mere days before the game shut down and then get upset because they didn't realize that it was closing. That leads to ill-will, credit card chargebacks, and other such things that Nutaku wishes to avoid.