Hello, I'm having a bug I think... On the level where you are supposed to make a level 5 nexus, everything is maxed, but the upgrade to level 5 on the nexus is still disabled. I can not upgrade anything else, the tiles pattern is ok, everything is ok, but I'm blocked. Anybody had this problem ?
No problem on my end, but do you have enough build points from cities? Also, on the last stretch, it doesn't seem like you need to upgrade it, as long as your tiles are matched, it will just go to Level 5 and complete the round for you.
