Upgrade for Free: Feature or bug?

TPQ

Cogito Ergo Civ
Joined
Oct 1, 2010
Messages
587
Location
UK
Hi,

I'm coming to the end of my first play-through of G&Ks now and just went to upgrade some of my infantry to mech inf and was surprised to find the cost of doing so was zero.

Zero_Cost_Upgrade.jpg


It is actually zero, as no money is subtracted from the treasury, so if it is a bug, it's not just a graphical one.

I'm playing as the Germans, on a large map, 16 civs, 16 city states, low sea level, raging barbs, quick combat, emperor level, epic speed, DX9.

I don't remember free upgrades from inf to mech inf when I played the Germans before G&Ks, so I'm wondering if this is a bug, or if I'm missing some cool feature I should know about?

Thanks!
 
Might be related to SPs/Wonders. I know a few reduce upgrade cost. It's possible the max upgrade discount got changed from 75% to 100%.
 
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