Quick question about sets: targets with the same symbol are a set, and each target in a set is worth an extra point if the set is completed. My question involves when only a single target has a unique symbol, like the tunnels. Does each individual tunnel count as a set of one, thus automatically scoring an extra point just by being hit? Or is the symbol only there for the sake of referencing the bonus/unlock it triggers, meaning that a set is strictly two or more targets with the same symbol?
I've been assuming that a set is strictly multiple targets, but since the tunnels tend to be more challenging to score, often needing to be unlocked and requiring doubles to hit, I've been wondering if the intent behind each having a unique symbol is that each tunnel automatically gets the set bonus.