List of hidden blocks in Mario & Luigi: Superstar Saga

In Mario & Luigi: Superstar Saga, Mario and Luigi can discover Hidden Blocks containing elusive Hoo Beans throughout the Beanbean Kingdom. By jumping around at suspicious platforms or patterns, or in seemingly "empty" dead ends, the Mario Bros. can uncover invisible blocks containing single Hoo Beans. If the Bros. reveal a block, then leave the area without collecting the bean, however, it will become invisible again until they do so. There are 42 Hidden Blocks in the game. This page lists the location of each hidden block and how to get to them. While the invisible blocks in the remake remain invisible, unlike the similarly invisible beanholes, it does introduce a new Starbeans Cafe reward called the Secret Specs, which allows the user to see the invisible blocks in the form of a white outline.

Hidden Block count
This chart shows the number of Hidden Blocks for each location, with the total amount at the bottom. Locations are listed in the order the player can visit them.