Spray the alcoves on the house with the balcony near the stream.Sitting in an alcove in the village building that has two towers on top.Floating in the air near a windmill in the village.In Episode 1, you can find it near the platforms that cross beneath the bridge to the windmill on the right. A Blue Coin appears in different spots in the lake from episode to episode, always underwater.It's underwater, right in front of the gate at the end of the stream Follow the stream at the end of the path you start on up toward the village.Bust through the doors in the base of one of the pillars for a coin.
You can then spray the second shape off the wall for the same thing to happen in reverse for two total Blue coins. You'll have a time limit to reach the matching shape before the Coin vanishes, and you have to restart. Spraying these off will cause a second X or O elsewhere in the level to spit out a Blue Coin. Painted letter "M"s on the sides of walls and structures.Some (not all!) will offer Blue Coins as a reward for fully cleaning them off When hunting for all Blue Coins, keep an eye out for the following: You will also never find Blue Coins within underground levels (where Shadow Mario takes your FLUDD away). 20 are located in Delfino Plaza (one is on Delfino Airstrip, which is considered part of Delfino Plaza), and each world off Delfino Plaza has 30 apiece except for Corona Mountain, which only has 10. In total, there are 240 Blue Coins in Super Mario Sunshine.