constructing Wonder

[carnivalsloth]

Hi successfully played 7 Wonders Architect with a family member who uses a tablet.
Hit a snag on 2nd game when constructing Wonder. If you need 3 of the same resources for the next part of the Wonder and have 2 stone, 2 bricks and get a gold coin how do you proceed to construct the next part of your Wonder?

[tonkoch]

It gives you the option of which of the two resources to use with the gold coin.

[carnivalsloth]

Thanks Tomkoch - difficulties overcome.