@hogman (US1) You collect contruction tokens from events or offers & when you have 50/50 you will get a pop-up to say that the construction slot is available to you. After that, be careful, because the next thing that you build or upgrade will automatically go to that slot & use up your 50 tokens (even if it is just building a 6 second deco) so try to start a long construction first so that it goes to the new slot & then you can use your regular slot like normal. (Temporary farms do not use the token slot)
Yeah, I've learned that lesson! I usually try to be careful about if I'm on the universal or construction slot. Ticks me off because I have wasted those coins :-( LOL
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