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The Metal Block is a recurring block throughout the Bloons games series. This block is impossible to destroy unless you use a Level Skip. They are highly annoying because they will stop you from reaching poppable bloons. Sometimes you need to use special power-ups (like the Rubber Block) to get bloons hidden behind them. Sometimes you just need to throw the dart over them to get to the bloons inside.
Metal sound in Bloons
Metal sound in Bloons 2 (the sound is quite similar)