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Cool thanks for the feedback! There already are bonus tiles though... the park bench already works as you describe the birdfeeder (giving a bonus to adjacent garden tiles). The BBQ doesn't *replace* a deck tile — that would suck to draw a BBQ before you had a deck already — but it does count as a deck tile, and gives a bonus to your entire deck.

From our first few playtests, it became clear that more interaction between players would be ideal, but I couldn't figure out how to make that happen...

You could try giving them different resources (eg Catan) and forcing them to trade to get what they need.