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@abt
I finally unlocked Ionstorm, which is night-and-day better than Cosmos!
As there seemed (and seems still) be some kind of sale (or JARSU or @superion’s Easter egg) I got all the accessories for free.
Something weird is going the accessories. They’re either all “FREE” or “0 coins” to upgrade. Some of them I was able to upgrade (for free), while others lists some unknown currency (see picture below), but does nothing when I tried to upgrade.
Free or “0” cost:

Shows unknown currency and does nothing when upgrading:
Edit: I upgraded to 2.8.1.0 and the accessories are back to normal now.