
In *Super Mario 3*, greying out the iconic blue mushroom houses is a lesser-known trick that can alter gameplay dynamics. By exploiting specific level design quirks and precise timing, players can manipulate the game’s mechanics to change the appearance of these houses, effectively greying them out. This technique often involves avoiding certain actions, such as collecting items or triggering events, which would otherwise keep the houses active. Mastering this trick not only adds a layer of challenge but also allows players to explore alternative strategies and uncover hidden secrets within the game’s vibrant worlds.
| Characteristics | Values |
|---|---|
| Game | Super Mario Bros. 3 |
| Platform | Nintendo Entertainment System (NES) |
| Release Year | 1988 (Japan), 1990 (North America) |
| Mushroom House Type | Grey-Blue |
| Function | Provides power-ups or items to Mario |
| Appearance | Small, grey-blue houses with a white door and red roof |
| Interaction | Mario must enter the house by walking into it |
| Contents | Random power-ups (e.g., Super Mushroom, Fire Flower, Starman) |
| Frequency | Appears in various worlds throughout the game |
| Strategy | Enter houses to gain advantages or recover health |
| Notable Worlds | World 1, World 2, and other early worlds |
| Rarity | Common in early stages, less frequent in later worlds |
| Visual Cue | Houses are stationary and easily identifiable on the map |
| Gameplay Impact | Enhances Mario's abilities temporarily |
| Historical Significance | Iconic feature of Super Mario Bros. 3's level design |
| Modern References | Often referenced in retro gaming discussions and speedruns |
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What You'll Learn

Location of Grey/Blue Mushrooms
In Super Mario Bros. 3, the grey and blue mushroom houses, often referred to as "Mystery Houses," are scattered throughout the game's worlds and offer unique power-ups or items. Locating these houses is crucial for players aiming to maximize their resources and enhance Mario's abilities. The grey and blue mushroom houses are typically found in specific levels within each world, and their placement follows a somewhat consistent pattern, though some may require exploration or specific actions to uncover.
World 1 (Grass Land): In this introductory world, the grey/blue mushroom house appears in Level 1-2. After the first set of blocks, you’ll encounter a series of floating platforms. Follow these platforms to the right, and you’ll find the house nestled near the end of the area. Entering this house often rewards you with a Super Mushroom or a Fire Flower, depending on your current power-up state.
World 2 (Desert Land): The grey/blue mushroom house in World 2-2 is located in a more hidden area. After crossing the first pit of quicksand, look for a small pipe on the ground. Enter the pipe, and you’ll be transported to a bonus area with the mushroom house. This house frequently contains a Super Leaf, which grants Mario the Raccoon Tail ability, allowing him to spin and fly for a short distance.
World 3 (Ocean Side): In World 3-2, the grey/blue mushroom house is situated near the end of the level. After navigating through the water-filled areas and avoiding enemies like Bloopers, you’ll find the house on a small island. This house often provides a Frog Suit, which is particularly useful for underwater levels, as it increases Mario’s swimming speed and grants him the ability to walk on water’s surface.
World 4 (Big Island): The grey/blue mushroom house in World 4-2 requires a bit of exploration. After the midpoint flag, look for a hidden beanstalk that leads to a sky area. At the top, you’ll find the mushroom house. This house typically rewards you with a Hammer Bros. Suit, allowing Mario to throw hammers at enemies, which is especially useful against foes like Koopa Troopas and Buzzy Beetles.
World 5 (The Sky): In World 5-2, the grey/blue mushroom house is located in a cloud-themed level. After navigating through the floating platforms and avoiding enemies like Bullet Bills, you’ll find the house near the end of the level. This house often contains a Super Mushroom or a Fire Flower, depending on your current power-up state.
By knowing the specific locations of these grey/blue mushroom houses, players can strategically plan their routes through each world to ensure they collect the most beneficial power-ups. Each house offers a unique advantage, making them invaluable for tackling the game’s challenges.
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Required Power-Ups for Access
In Super Mario Bros. 3, accessing the grey and blue mushroom houses requires specific power-ups that allow Mario to reach hidden or alternate paths. These houses often contain valuable items, such as extra lives or rare power-ups, making them essential for players aiming to maximize their resources. The first critical power-up for accessing these houses is the Super Leaf, which turns Mario into Raccoon Mario. This form grants him the ability to spin his tail to attack enemies and, more importantly, gives him a limited flight capability by holding the jump button. This flight is crucial for reaching elevated or otherwise inaccessible mushroom houses, particularly the grey ones that are often hidden in clouds or high above the ground.
Another essential power-up is the Tanooki Suit, an upgraded version of the Super Leaf. The Tanooki Suit not only allows Mario to fly but also gives him the ability to transform into a statue temporarily, which can be used to bypass certain obstacles or enemies. This suit is particularly useful for accessing blue mushroom houses, which are typically more challenging to reach and may require precise maneuvering or the ability to withstand enemy attacks while in transit. Both the Super Leaf and Tanooki Suit can be obtained from regular mushroom houses or as rewards for completing levels, but their strategic use is key to unlocking the secrets of the grey and blue houses.
The Hammer Bros. Suit is another power-up that can aid in accessing these hidden houses, though it is less commonly required. This suit allows Mario to throw hammers at enemies and break certain blocks, which can open up new pathways or clear obstacles blocking the way to a mushroom house. While not as versatile as the Raccoon or Tanooki forms for reaching elevated areas, the Hammer Bros. Suit can be invaluable in specific levels where block destruction is necessary to reveal hidden entrances.
Lastly, the Frog Suit, obtained from specific green mushroom houses, is useful for underwater levels where grey or blue houses might be hidden. The Frog Suit increases Mario’s swimming speed and agility, allowing him to navigate underwater environments more efficiently. While not directly related to reaching elevated houses, mastering underwater levels with the Frog Suit can lead to discovering hidden mushroom houses that contain unique rewards. Each of these power-ups serves a distinct purpose, and understanding when and how to use them is essential for fully exploring the secrets of Super Mario Bros. 3.
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Level Layout Differences
In Super Mario 3, the grey and blue mushroom houses serve as hidden bonus areas, offering unique challenges and rewards. The level layout differences between these two types of houses are crucial for players aiming to maximize their benefits. Grey mushroom houses typically appear in earlier worlds, such as World 1 and World 2, and are designed to introduce players to the mechanics of these bonus stages. Their layouts are generally simpler, featuring fewer obstacles and enemies, making them more accessible for beginners. For instance, a grey house might contain a single path with a few Goombas and a question block containing a power-up, leading directly to a treasure chest with a prize like a Mushroom or a 1-Up.
Blue mushroom houses, on the other hand, are introduced in later worlds, such as World 3 and beyond, and are significantly more complex in their level layout differences. These houses often feature multiple paths, hidden areas, and more challenging obstacles like moving platforms, Thwomps, or even auto-scrolling sections. For example, a blue house might require Mario to navigate a series of disappearing and reappearing blocks while avoiding enemies, or to choose between two paths, one of which leads to a better reward. The increased difficulty reflects the progression of the game and rewards skilled players with better prizes, such as rare power-ups or additional lives.
Another key level layout difference is the presence of mini-games or puzzles within blue mushroom houses. While grey houses usually stick to straightforward platforming, blue houses often include interactive elements like card-matching games or switch-activated platforms. These puzzles require players to think strategically and act quickly, adding a layer of complexity that is absent in grey houses. Successfully completing these mini-games can yield high-value rewards, such as a Super Leaf or a Starman, which can significantly aid Mario in upcoming levels.
The placement of enemies and hazards also varies between grey and blue mushroom houses, highlighting further level layout differences. Grey houses tend to have predictable enemy patterns, often limited to basic foes like Goombas or Koopa Troopas. In contrast, blue houses may introduce more dangerous enemies, such as Boos or Fire Bros., and place them in positions that require precise timing or clever maneuvering to avoid. Additionally, blue houses are more likely to include environmental hazards like lava pits or bottomless pits, increasing the overall risk and reward of exploration.
Finally, the visual design and thematic elements of grey and blue mushroom houses contribute to their level layout differences. Grey houses often have a more uniform and basic appearance, with plain backgrounds and minimal decorations. Blue houses, however, are typically more elaborate, featuring themed environments like underwater settings, cloud levels, or even fortress-like interiors. These thematic variations not only make blue houses more engaging visually but also influence their gameplay, as the environment may introduce unique mechanics or challenges. For example, an underwater blue house might require Mario to swim through currents or avoid Bloopers, adding a distinct twist to the usual platforming formula.
Understanding these level layout differences is essential for players looking to master Super Mario 3's grey and blue mushroom houses. By recognizing the patterns and challenges specific to each type, players can approach these bonus areas with confidence, optimize their routes, and maximize their rewards. Whether navigating the simplicity of a grey house or tackling the complexity of a blue house, this knowledge ensures a more enjoyable and successful gaming experience.
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Enemies and Obstacles Inside
In the grey-blue mushroom houses of Super Mario 3, players will encounter a variety of enemies and obstacles that require careful navigation and strategy to overcome. One common enemy found inside these houses is the Buzzy Beetle, a persistent foe that walks back and forth along platforms. Buzzy Beetles are immune to fireballs, so Mario must rely on jumping on them or using other power-ups like the Hammer Suit to defeat them. Their placement often forces players to time their jumps carefully to avoid taking damage.
Another significant obstacle inside the grey-blue mushroom houses is the moving platforms. These platforms shift horizontally or vertically, making it challenging for Mario to maintain his footing. Players must master precise jumping and timing to avoid falling into pits or colliding with enemies. Sometimes, these platforms are paired with Spikes or Fire Bars, adding an extra layer of danger. Fire Bars, in particular, rotate continuously, requiring Mario to wait for the right moment to pass through or jump over them.
Boos, the ghost-like enemies, also make an appearance in these houses. Boos are unique because they only move when Mario is facing away from them. To defeat them, players must use the Super Leaf power-up to turn into Raccoon Mario and strike them with the tail. Alternatively, Mario can avoid Boos by facing them directly, causing them to freeze in place. Their unpredictable movement patterns make them a tricky enemy to deal with, especially in tight spaces.
Piranha Plants are another recurring obstacle inside the grey-blue mushroom houses. These enemies emerge from pipes and bite at Mario if he gets too close. Players must either jump over them or use power-ups like the Fire Flower to defeat them from a safe distance. Some Piranha Plants are placed in patterns that require Mario to carefully plan his route, as their timing can be difficult to predict.
Lastly, lava pits and bottomless pits are common hazards in these houses. Lava pits deal damage upon contact, while bottomless pits result in instant death if Mario falls in. These hazards are often paired with moving platforms or enemies, forcing players to stay alert and make quick decisions. To navigate these areas safely, players should prioritize collecting power-ups and mastering precise movement to avoid fatal mistakes. By understanding the behavior of each enemy and obstacle, players can successfully clear the challenges inside the grey-blue mushroom houses in Super Mario 3.
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Secrets and Hidden Items
In Super Mario Bros. 3, the grey and blue mushroom houses are hidden levels that offer unique challenges and rewards. To uncover these secrets, players must explore the game world with a keen eye for detail. One of the most effective methods to find these houses is by using the Hammer Bros. suit, which allows Mario to throw hammers and destroy certain blocks that may conceal entrances. Look for suspicious areas in levels such as World 1-2 and World 3-3, where a well-placed hammer throw can reveal a hidden vine or a warp pipe leading to a grey or blue mushroom house.
Another technique to discover these hidden houses is by utilizing the Racoon Leaf power-up, which grants Mario the ability to fly. In levels like World 2-3 and World 5-1, fly to the top of the screen or to seemingly inaccessible areas. Often, these houses are tucked away above the main level path, requiring Mario to reach great heights to uncover them. Keep an eye out for floating platforms or clouds that might indicate a hidden area nearby.
Secret whistles are also key to accessing grey and blue mushroom houses. In levels such as World 1-1 and World 4-1, locate the hidden Midway Gate by backtracking or exploring off the main path. Blowing the whistle at these gates will reveal a warp zone, sometimes leading directly to a grey or blue mushroom house. These houses often contain valuable power-ups like the P-Wing, which grants Mario a permanent cape for a single level.
For players seeking a more direct approach, certain levels have invisible blocks that can be uncovered by running or jumping repeatedly in specific areas. For example, in World 2-2, a series of invisible blocks near the end of the level leads to a hidden vine. Climbing this vine will take Mario to a grey mushroom house. Similarly, in World 3-1, a hidden block near the ceiling can be hit with a hammer or jumped on to reveal a beanstalk, which leads to a blue mushroom house.
Lastly, don’t overlook the power of trial and error. Some grey and blue mushroom houses are hidden behind fake walls or require precise timing to access. In World 7-1, for instance, a seemingly solid wall near the beginning of the level can be passed through if Mario runs and jumps at the correct angle. These houses often reward persistence with rare items like extra lives or power-ups, making the effort well worth it. By combining these strategies and staying observant, players can uncover all the secrets of the grey and blue mushroom houses in Super Mario Bros. 3.
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Frequently asked questions
In Super Mario Bros. 3, mushroom houses turn grey when you enter them and either lose a life or exit without obtaining a prize. This indicates the house has been "used" and will not provide another item until you revisit it in a later level.
No, once a mushroom house turns grey, it remains that way for the rest of the game. You cannot revert it back to blue, but you can visit other blue houses for more prizes.
If you enter a grey mushroom house, you will not receive a prize or bonus item. The house is essentially "empty" until you revisit it in a later level, at which point it may turn blue again and offer a new prize.
No, there are no benefits to entering a grey mushroom house, as it will not provide any items or bonuses. It’s best to focus on blue houses or other gameplay elements to maximize your rewards.

























