In Paper Mario: Sticker Star, Mario can discover Hidden Blocks throughout the areas he visits. Like regular ? Blocks, these invisible blocks contain Stickers or Coins. Unlike other entries where Mario had help in finding these, he must locate them alone by either Jumping or Hammering suspicious areas. Like in Super Paper Mario, the ? Blocks (which includes hidden blocks) respawn upon leaving the area, so subsequent visits allow the contents of the blocks to be collected again. Some invisible blocks are used as stepping stones to reach new places or other items. There are 84 hidden blocks in the game. This page lists the location of each hidden block, the contents, and how to get to them.
Also, Mario can only collect the contents of the blocks in The Enigmansion before defeating the Big Boo, because after the defeat, these blocks permanently despawn.
Hidden Blocks
| Location | Item | Description | Image | Image (block/s revealed) |
|---|---|---|---|---|
| Decalburg |  Coin |
In the left house of the second scene, above the cabinet reached by stack a paper right of it. | 
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| Bouquet Gardens | Coin |
In the first scene, right of the Hopslipper sticker. This block acts as a platform to said sticker, which is otherwise unreachable. | 
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| Bouquet Gardens | Coin |
In the fourth scene, above the left circle of flowers that can be bloomed by hammering. | 
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| Water's Edge Way |   Shell (first time), Hammer (later times)   Line Jump (first time), Jump(later times) |
In the first scene, above the flowers on the island in the middle of the lower part. | 
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| Water's Edge Way |  Iron Jump |
In the second scene, found above the flower and between the 2 visible ? Blocks. | 
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| Water's Edge Way |  Shiny Shell |
In the third scene, in the part reachable only by opening in the fourth scene, above the circle of flowers that can be bloomed by hammering. | 
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| Whammino Mountain | Coin (both) |
In the fourth scene, in the northeastern corner. Available only after knocking down the tree in the southeast. Together with Brick Block also found here, they act as a stairs to reach a platform with coins to the left. | 
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| Whammino Mountain |  Fire Flower |
In the third scene, in the northwestern corner, above the flower. Available only after putting back the White Gate scrap via paperization. | 
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| Goomba Fortress | Coin (all 5) |
In the northeastern scene, right of the northern platform. These 5 blocks act as a platform to reach a ? Block hanging in the air. | 
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| Goomba Fortress |  Poison Mushroom |
In the tower scene, above the stairs between the last two ? Blocks. | 
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| Drybake Desert |  Shiny Jump |
In the third scene, above the second Brick Block. | 
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| Drybake Desert | Shiny Jump |
In the fourth scene, above the flower in the east. | 
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| Drybake Desert | Shiny Jump |
In the fifth scene, near the entrance, between two Brick Blocks. | 
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| Drybake Desert | Coin (both) |
In the underground scene, near the upper ? Block. Together with a block created by paperization, these 2 blocks as platforms to reach said ? Block. | 
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| Yoshi Sphinx |  Slaphammer |
In the second scene, above the flower near the entrance warp pipe. | 
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| Yoshi Sphinx | Coin |
In the scene reached by a north opening in the third sphinx scene, at the top, left of the ? Block floating in the air. | 
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| Sandshifter Ruins | Coin |
In the outside scene, under the ? Block. | 
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| Sandshifter Ruins | Coin |
In the scene reached by a door by going right->right from the top of the main scene, under the ? Block high up in the air. Acts as a platform to reach said block. | 
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| Sandshifter Ruins | Coin (all 4) |
In the scene reached by a door by going right->right->right from the top of the main scene, in front of the wall with Bowser Tape in the east. These 4 blocks act as a platform to reach said tape. | 
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| Sandshifter Ruins | Coin |
At the bottom of the main scene by going right->right->left->left (only during the subsequent visits) and going through the door is a scene with multiple sarcophagi. On the ground, left of the ? Block above the right spikes. | 
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| Sandshifter Ruins | Coin |
Same scene, after previous hidden block and a block created by paperization, next to the ? Block. Together with the previously mentioned blocks, these three act as a platforms to reach said ? Block. | 
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| Sandshifter Ruins |  Flashy Clone Jump |
Same scene, above the previously mentioned ? Block. | 
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| Damp Oasis |  Burnhammer |
In the second scene, on the roof, above the barrel. | 
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| Leaflitter Path | Line Jump |
In the third scene, above the Brick Block found in the lower poisonous water. | 
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| Loop Loop River | Coin (all 3) |
In the west scene, between two elevated grounds. Unlike other blocks, these three does not respawn and stay empty for the rest of the game. | 
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| Loop Loop River |  Flashy Jump |
In the upper middle scene, there are four coins floating above the river. The block can be found between them. | 
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| Rustle Burrow |  Shiny Hopslipper  POW Block |
In the second scene, above the stone slabs. | 
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| Rustle Burrow |  Hurlhammer |
In the scene south of the third scene, in front of the northern exit. | 
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| Rustle Burrow | Burnhammer |
In the scene north of the third scene, above the stone slab near the entrance. | 
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| Rustle Burrow | Coin (both) |
In the second scene, above the stone slabs in the upper part. | 
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| Rustle Burrow | Shell |
In the scene north of the third scene, behind the spiderweb and above the highest Brick Block. | 
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| Gauntlet Pond | Fire Flower |
In the second scene, in the northwest, between two Brick Blocks. | 
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| Gauntlet Pond |  Chillhammer |
In the third scene, above the first Brick Block. | 
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| Gauntlet Pond | Shell |
Same scene, above the second Brick Block. | 
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| Holey Thicket |  Shiny Hammer |
In the first scene, after jumping into the underground area, above the stone slab. | 
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| Whitecap Beach |  Flashy Hopslipper |
In the second scene, above the flower found next to the ? Block in the east of the scene. | 
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| Snow Rise |  Shiny Line Jump |
In the first scene, above the first rock. | 
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| Snow Rise |  Shiny Eekhammer |
In the third scene, above the wilted flower in the southeast. | 
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| Snow Rise |  Flashy Ice Flower |
Same scene, above the ? Block reached by the previous hidden block. | 
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| Snow Rise | Shiny Shell |
In the second scene, above the wilted flower in the west of the upper part. | 
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| Snow Rise | Shiny Line Jump Shiny Shell |
In the scene north of the second one, above the ? and Recovery Blocks | 
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| Ice Flow | Burnhammer |
In the third scene, after going on the elevated ground and reaching its top, the perspective changes. The block is above the flower between Recovery Block and a tree. | 
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| Ice Flow | Coin (all 3) |
In the fourth scene, above the three wilted flowers in the middle part. | 
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| Ice Flow | Coin (all 5) |
Same scene, found right of the wilted flower found at the upper part. Together with the last three, these eight blocks serve as platforms to reach a Flashy Slaphammer and Secret Door Stickers. | 
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| The Enigmansion | Shiny Hopslipper |
On the dining hall table, above the blue wilted flower. | 
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| The Enigmansion |  Tail |
Same room, above the previous block. | 
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| The Enigmansion |  Super Boot |
Same room, above the block created with the paperization. | 
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| The Enigmansion |  10-Coin |
Same room, in the upper part are 3 doors with rooms mostly identical to the houses in Decalburg. This Hidden Block can be found above the cabinet in the left room. | 
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| Bowser's Snow Fort | Shiny Shell |
In the first scene, between the two entrances and above the wilted flower. | 
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| Shy Guy Jungle |  Flashy Iron Jump |
In the first scene, above the ? Block found at the west end of the lower part. | 
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| Shy Guy Jungle | Shiny Shell |
In the third scene, above the circle of flowers that can be bloomed by hammering, found in the southeast. | 
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| Shy Guy Jungle | Coin |
In the seventh scene, in the northwest of the lower part. Required to progress to reach the big red flower in time. | 
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| Chomp Ruins | Coin (all 3) |
In the second inside scene, near the end of the middle part. Required to progress. | 
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| Chomp Ruins | Coin |
In the outside area, left of the last Bomp emerging from the waterfall. | 
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| Chomp Ruins | Coin (all 3) |
Going up the stairs from the previous block, another three are found above the flower. These three act as platform to get the Big Shiny Baahaamer sticker. | 
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| Chomp Ruins | Coin (all 3) |
In the last part of the outside area, there is a flower left of the waterfall. Three blocks can be created in fron of the waterfall. | 
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| Rumble Volcano | Shiny Jump |
In the scene with the sticker shop, in the southwest, left of the warp pipe and above the flower. | 
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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.
| Location | Count |
|---|---|
| Decalburg | 1 |
| Bouquet Gardens | 2 |
| Water's Edge Way | 4 |
| Whammino Mountain | 3 |
| Goomba Fortress | 6 |
| Drybake Desert | 5 |
| Yoshi Sphinx | 2 |
| Sandshifter Ruins | 9 |
| Damp Oasis | 1 |
| Leaflitter Path | 1 |
| Loop Loop River | 4 |
| Rustle Burrow | 7 |
| Gauntlet Pond | 3 |
| Holey Thicket | 1 |
| Whitecap Beach | 1 |
| Snow Rise | 6 |
| Ice Flow | 9 |
| The Enigmansion | 4 |
| Bowser's Snow Fort | 1 |
| Shy Guy Jungle | 3 |
| Chomp Ruins | 10 |
| Rumble Volcano | 1 |
| Total | 84 |