World 13 (Dr. Mario World)

World 13 is an underground crystal cavern world resembling Tilted Tunnel from New Super Mario Bros. U in Dr. Mario World. The first area is available as of 1 AM PT on Mar. 5, 2020, while the second area, challenge stages and special stage are available as of 2 AM PT on Mar. 19, 2020.

When an area is cleared, Bony Beetles, Bone Goombas, and Swoops appear. The viruses featured in the regular stages are red, yellow and blue, with the exception of one stage, which has green viruses in addition to blue.

Stage names in bold red text are labelled as hard stages in the game.

Area 1

Image	Stage	Best Doctors	Overview
	Stage 481	Dr. Bowser Jr. Dr. Peach	This stage introduces bubble machines, which will activate when a match adjacent to it is made, and will cover a virus or certain objects in a bubble when another match adjacent to it is made. The objective of this stage is to eliminate all viruses. The Brick Blocks in the fifth row contain hidden viruses.
	Stage 482	Dr. Rosalina Dr. Bowser Jr.	The objective of this stage is to eliminate all viruses, collect all purple coins and collect all keys. In this stage, three rows containing four purple coins in bubbles are below three rows of viruses. Bubble machines can be found between the rows of viruses. Caged purple coins do not need to be unlocked to be able to pop its bubble. Purple coins are unlocked in the following sequence: The purple coins originally found in the eighth row. The purple coins originally found in the sixth row. The purple coins originally found in the fourth row.
	Stage 483	Dr. Bowser Jr. Dr. Ludwig	The objective of this stage is to eliminate all viruses. In this stage, half-frozen viruses are found in a formation of a diamond with a bubble machine in the middle. Brick Blocks form a border in the shape of a diamond around the ones near ice fans being half-frozen. The ones that are not frozen contain hidden viruses. Additionally, there are two bubble viruses originally near the ice fans.
	Stage 484	Dr. Koopa Troopa Dr. Bowser Jr.	The objective of this stage is to eliminate all viruses and destroy all Brick Blocks. In this stage, Brick Blocks behind cages are found on the three leftmost columns and three rightmost columns, with bubble viruses and the lock blocks corresponding to the opposite cages in between. The middle three columns just contain viruses.
	Stage 485	Dr. Wario Dr. Larry	The objective of this stage is to collect all virus coins. On the three leftmost columns and the three rightmost columns, colorful crates are lined in four columns, along with Floatie Viruses and Brick Blocks containing hidden viruses between the columns of colorful crates. The middle columns contain viruses in groups of nine above a row of bubble machines. All virus coins are sized 3x3 and are found along the first to third rows and fifth to seventh rows.
	Stage 486	Dr. Fire Rosalina Dr. Dry Bowser	The objective of this stage is to eliminate all viruses (including any that appear from flasks) and collect all purple coins. In this stage, caged purple coins surround barrels, with some partially revealing its contents that include exploders and viruses. All but one unbroken barrel contain viruses, in which a purple coins if hidden there instead. Filled flasks in this stage will shoot out either shells or viruses. Purple coins are unlocked in the following sequence: The coin in the middle, undamaged barrel. The coins surrounding the barrels.
	Stage 487	Dr. Daisy Dr. Kamek	The objective of this stage is to eliminate all viruses. In this stage, several viruses are locked behind cages, along with bubble machines. Every Brick Block contains a hidden lock block, with exploders next to the yellow one in the middle and the red and blue ones in the top row (left and right, respectively).
	Stage 488	Dr. Wario Dr. Yoshi	The objective of this stage is to collect all purple coins and collect all keys. In this stage, viruses forming a diamond are shrouded in clouds, and are between keys and doors. The Brick Blocks from the seventh to tenth rows contain keys and the Brick Blocks from the second to fifth rows contain doors. A formation of purple coins are found next to the Brick Blocks containing doors. Purple coins are unlocked in the following sequence: The coins in the fifth row. The coins in the fourth row. The coins in the third row. The coins in the second row. The coin in the first row.
	Stage 489	Dr. Dry Bowser Dr. Ludwig	The objective of this stage is to eliminate all yellow viruses (eliminating red and blue viruses do not contribute to the objective). In this stage, the middle yellow viruses are locked behind cages and surrounded by yellow colorful crates and Empty Blocks in the middle three columns. In the other columns, yellow viruses are found in pairs except for one which is paired with a yellow lock block, where they are next to Brick Blocks. Fully-frozen red and blue viruses are also available.
	Stage 490	Dr. Larry Dr. Roy	The objective of this stage is to eliminate all viruses, destroy all colorful crates and collect all keys. In this stage, the middle column contains Brick Blocks and a door in bubbles, with the door starting from a position between columns of crates until the end where Brick Blocks would be next to it. Colorful crates in groups of three-in-a-row are available, with viruses occupying the rest of the spaces except for the middle column. This stage will scroll for one line each time enough objects are cleared, and will stop after 5 lines are introduced.
	Stage 491	Dr. Waluigi Dr. Roy	The objective of this stage is to eliminate all viruses and destroy all barriers. This stage is shaped like a right-angle triangle, with crates, barriers shrouded in cloudes and dust containing Floatie Viruses. Filled flasks in this stage will shoot out either shells or crates.
	Stage 492	Dr. Larry Dr. Ludwig	The objective of this stage is to eliminate all viruses and collect all keys. In this stage, doors and half-frozen keys are placed next to some colorful crates, with six of the doors being fully-frozen.
	Stage 493	Dr. Fire Luigi Dr. Ludwig	The objective of this stage is to eliminate all viruses and destroy all Brick Blocks. In this stage, fully-frozen Brick Blocks form a boundary that surround the viruses in it. There are viruses outside the boundary that are also next to bubble machines. Ice fans and Empty Blocks are found in the top row of the stage.
	Stage 494	Dr. Baby Daisy Dr. Roy	The objective of this stage is to eliminate all viruses, collect all coins from Coin Blocks and destroy all crates. In this stage, Brick Blocks each containing coins are found between viruses at the top and bottom in groups of columns of three, which are all between crates in groups of three in a column in a cascading pattern.
	Stage 495	Dr. Daisy Dr. Toad	The objective of this stage is to eliminate all viruses and destroy all barriers. In this stage, barriers are found next to groups of caged viruses, with a lock block found at the bottom surrounded by barriers and cages and at the top locked behind a cage.
	Stage 496	Dr. Baby Peach Dr. Wendy	The objective of this stage is to eliminate all viruses, collect all coins from Coin Blocks and collect all purple coins. In this stage, half-frozen viruses are found in the middle surrounded by Brick Blocks. The leftmost column, rightmost column, top row and bottom row of Brick Blocks contain coins. Purple coins are unlocked in the following sequence: The coins in the leftmost and rightmost columns. The coins inthe topmost row and the four coins at the seventh and eighth rows. The rest of the coins found in the second and third rows.
	Stage 497	Dr. Roy Dr. Bowser Jr.	The objective of this stage is to eliminate all viruses and destroy all crates. In this stage, crates in groups of three in a column are found in the first three rows, with viruses and exploders between them. Three bubble machines are found in the eighth row. Each column also has one bubble, either encasing Brick Blocks or viruses.
	Stage 498	Dr. Wendy Dr. Diddy Kong	The objective of this stage is to eliminate all viruses, collect all coins from Coin Blocks and collect all purple coins. In this stage, two shells are found in the middle column, where they are aligned with viruses and purple coins. Clearing the blue lock block unlocks cages containing viruses in the rows containing Empty Blocks while clearing the red lock block unlocks the cages containing Brick Blocks containing coins. Purple coins are unlocked in the following sequence: The coins in the same rows as the shells. The coins in the leftmost and rightmost columns. The coins in the third and seventh rows. The rest of the coins in the second and eighth rows.
	Stage 499	Dr. Diddy Kong Dr. Dry Bowser	The objective of this stage is to eliminate all yellow viruses (eliminating red and blue viruses do not contribute to the objective) and destroy all barriers. In this stage, the yellow viruses are all found in undamaged barrels, each of them directly below a barrier. Between barrels, red and blue Floatie Viruses are found.
	Stage 500	Dr. Bowser Jr. Dr. Larry	The last stage of the first area, the objective of this stage is to eliminate all viruses and collect all purple coins. In this stage, all colorful crates are wrapped in bubbles, with several of them floated upwards toward viruses. The initial three rows and the three rows after that also contain half-frozen coins and viruses covered in dust. Brick Blocks do not containing anything. This stage will scroll for one line each time enough objects are cleared, and will stop after 7 lines are introduced. Purple coins are unlocked in the following sequence: The coin initially at the third row. The coin initially at the second row. The coin initially at the first row. The coins after the stage scrolls 3 lines, each revealed row containing one coin. The coins that appear after the stage scrolls 6 lines. When cleared, the rest of the first area in the world map gets cleared of viruses. Players also obtain the Bony Beetle assistant upon completing this stage.

Area 2

Image	Stage	Best Doctors	Overview
	Stage 501	Dr. Fire Luigi Dr. Bowser	The objective of this stage is to eliminate all viruses. In this stage, there are bubble machines in the middle column surrounded by viruses shrouded in clouds. Exploders and Brick Blocks inside bubbles are found below viruses in the two leftmost and two rightmost columns.
	Stage 502	Dr. Fire Rosalina Dr. Daisy	The objective of this stage is to eliminate viruses and collect all purple coins. In this stage, the purple coins are arranged in a swirling line, with viruses, Brick Blocks (some containing hidden viruses), Capsule Plus and lock blocks within the swirl. Purple coins are unlocked in the following sequence: The coins in the first two rows. Three coins in the rightmost column, from the third row to the fifth row. The other two coins in the rightmost column and the one coin in the eighth column. The coins in the eighth and ninth rows. The coins in the first two columns. The coins in the third row. The coins in the sixth and seventh columns. The rest of the coins found within the fifth to seventh rows and third to fifth columns.
	Stage 503	Dr. Koopa Troopa Dr. Baby Daisy	The objective of this stage is to eliminate all viruses and collect all coins from Coin Blocks. In this stage, the Floatie Viruses are locked in cages, with its lock blocks located below bubble machines. The viruses and lock blocks are half-frozen. All Brick Blocks contain coins.
	Stage 504	Dr. Waluigi Dr. Ludwig	The objective of this stage is to eliminate all viruses and collect all purple coins. In this stage, purple coins are lined diagonally, and the crates and bubble machines are fully-frozen. All dust cover viruses. Purple coins are unlocked in the following sequence: The coins along the line from the ninth row of the middle column to the fifth row of the rightmost column. The coins along the line from the eighth row of the second column to the second row of the eighth column, the coins along the line from the fourth row of the eighth column to the third row of the rightmost column and a coin in the sixth row of the second column. The rest of the coins, which are the coins along the line from the fifth row of the leftmost column to the first row of the middle column and The single coin in the seventh row of the first column.
	Stage 505	Dr. Fire Rosalina Dr. Bowser Jr.	The objective of this stage is to eliminate all viruses and collect all virus coins. Above the bubble machines, regular viruses, fully-frozen viruses, Brick Blocks and viruses in bubbles cover the virus coins except the middle fully-frozen virus. Below the bubble machines, virus coins are found behind the viruses inside bubbles and Brick Blocks, in addition to a few other viruses.
	Stage 506	Dr. Bowser Jr. Dr. Kamek	The objective of this stage is to eliminate all viruses. In this stage, bubble machines forming a swirling line are found in the middle columns, with several half-frozen viruses within the "curves". On the two leftmost and two rightmost columns, half-frozen viruses are found among Brick Blocks. Crates are found between the columns with bubble machines and the columns with Brick Blocks.
	Stage 507	Dr. Dry Bowser Dr. Roy	The objective of this stage is to eliminate all viruses and destroy all crates. This stage is shaped like a heart formed by crates and ice fans. Seven exploders are located above the ice fans, while some viruses within the "heart" are half-frozen and fully-frozen.
	Stage 508	Dr. Koopa Troopa Dr. Fire Luigi	The objective of this stage is to collect all virus coins. In this stage, Brick Blocks form a boundary that splits the stage into four quadrants, with the bottom quadrants containing barrels, all of them containing exploders. An exploder is located in between the bottom row of barrels. Four keys are found, with their respective doors in the topmost row of Brick Blocks. Flasks are hidden in the Brick Blocks in the leftmost and rightmost columns in the fifth and ninth rows, and an exploder is hidden in a Brick Block in the fourth row of the middle column. Viruses and Floatie Viruses are hidden in the other Brick Blocks. Filled flasks in this stage will shoot out either empty Brick Blocks or Brick Blocks with hidden viruses.
	Stage 509	Dr. Bowser Dr. Larry	The objective of this stage is to eliminate at least 25 blue viruses, eliminate at least 30 green viruses and destroy at least 25 colorful crates. In this stage, viruses and colorful crates are found throughout, and unlike the other stages in this world, only two colors are available, being blue and green. This stage will scroll for one line each time enough objects are cleared, and will stop after 13 lines are introduced.
	Stage 510	Dr. Waluigi Dr. Roy	The objective of this stage is to eliminate all viruses and destroy all crates. In this stage, crates form a circle filled in a checkered pattern, with dust in between the crates. The dust in the middle covers a flask, while the others cover viruses. Filled flasks in this stage will shoot out either exploders or barriers.
	Stage 511	Dr. Fire Rosalina Dr. Dry Bowser	The objective of this stage is to destroy all barriers and collect all purple coins. In this stage, every object in the second to fourth rows are half-frozen, including purple coins, bubble machines and viruses. In the first row, barriers are above the bubble machines and caged coins are between the barriers. Additiona viruses and caged coins are located below the columns with viruses and coins. Filled flasks in this stage will shoot out either viruses, shells or exploders. Purple coins are unlocked in the following sequence: The half-frozen coins in the second row. The coins in the tenth row. The coins in the first row, between the barriers. The coins in the ninth row.
	Stage 512	Dr. Roy Dr. Dry Bowser	The objective of this stage is to collect all coins from Coin Blocks and destroy all crates. In this stage, many viruses are found among barrels and crates, and some of them are half-frozen or fully-frozen. All barrels contain Brick Blocks each containing coins.
	Stage 513	Dr. Waluigi Dr. Fire Peach	The objective of this stage is to eliminiate all viruses. In this stage, viruses are mainly found in the middle five columns, among four bubble machines and caged viruses and crates. On the leftmost column, there are lock blocks inside bubbles, while on the rightmost column, there are viruses inside bubbles. All dust cover viruses, and can be affected by bubble machines to remove the dust and be inside bubbles instead.
	Stage 514	Dr. Koopa Troopa Dr. Mario	The objective of this stage is to eliminiate all viruses and collect all keys. In this stage, keys are hidden in the Brick Blocks at the seventh to ninth rows, while doors are hidden in the Brick Blocks in the first and second rows. Viruses in bubbles are surrounded by the bottom portion of Brick Blocks.
	Stage 515	Dr. Mario Dr. Wendy	The objective of this stage is to collect all coins from Coin Blocks, collect all virus coins and collect all purple coins. In this stage, the objects form a rotational symmetry, except for the lock blocks and the cages. Exploders are each located next to two purple coins and diagonally adjacent to a Brick Block and two viruses. All Brick Blocks contain coins. Purple coins are unlocked in the following sequence: The coins within the seventh to eighth row and fifth to seventh columns. The coins within the third to fifth row and seventh to eighth columns. The coins within the second to third row and third to fifth columns. The coins within the fifth to seventh row and second to third columns.
	Stage 516	Dr. Luma Dr. Larry	The objective of this stage is to eliminate all viruses and destroy all colorful crates. In this stage, all viruses are locked behind cages in a checkered pattern, except for the middle where there is a blue lock block and the top middle where a red lock block is in a cage. Colorful crates and a yellow lock block are situated between viruses.
	Stage 517	Dr. Daisy Dr. Ludwig	The objective of this stage is to eliminate all viruses and collect all purple coins. In this stage, purple coins are placed in a cascading pattern, with a many of them half-frozen. Between the lines of purple coins, there are viruses and Capsule Plus arranged in "L" tromino patterns, with the pivot viruses being half-frozen. Purple coins are unlocked in the following sequence: The coins along the line from the ninth row of the seventh column to the seventh row of the rightmost column. The coins along the line from the ninth row of the fourth column to the fourth row of the rightmost column. The coins along the line from the ninth row of the leftmost column to the first row of the rightmost column. The coins along the line from the sixth row of the leftmost column to the first row of the sixth column. The coins along the line from the third row of the leftmost column to the first row of the third column.
	Stage 518	Dr. Daisy Dr. Larry	The objective of this stage is to eliminate all viruses, collect all purple coins and collect all keys. In the middle of the stage, a shell is in the same row as the red and yellow lock blocks, and a blue lock block is found in the top row in the middle. Some of the colorful crates and the purple coins are half-frozen. In addition, crates are found in the leftmost and the rightmost columns. Purple coins are unlocked in the following sequence: The coins in the leftmost and rightmost columns and the coins in the ninth row. The coins in the second and eighth columns. The coins in the first row. The rest of the coins in the second row.
	Stage 519	Dr. Fire Rosalina Dr. Roy	The objective of this stage is to collect all coins from Coin Blocks and destroy all crates. In this stage, several bubble machines are located in the odd-numbered columns, most of them half-frozen. Exploders are found in the sixth row. All Brick Blocks contain coins. Filled flasks in this stage will shoot out exploders.
	Stage 520	Dr. Roy Dr. Toad	The final stage is a scrolling stage that requires all viruses to be eliminated and keys to be collected. In this stage, the middle column contains viruses, keys and lock blocks inside bubbles. On the left and right sides in the beginning, crates, a few Empty Blocks and a few half-frozen bubble machines form a path containing viruses. After the stage scrolled up far enough, there exploders and doors in cages, along with several viruses above Empty Blocks. This stage will scroll for one line each time enough objects are cleared, and will stop after 7 lines are introduced. Once it is cleared, the remaining area of the stage map gets cleared of viruses, and players can access World 14. Upon completion, players earn a free Staff Ticket that lets them unlock either a new doctor, a new assistant, or leveling up an existing doctor or assistant.

Challenge stages

Image	Stage	Best Doctors	Overview
	Stage 13A	Dr. Larry Dr. Dry Bowser	Within a 70 second time limit, players need to eliminate all viruses and destroy all colorful crates. In this stage, colorful crates arranged in a checkered pattern, and are found in barrels except for the bottom-most row of colorful crates. Viruses are found between the gaps of colorful crates. Completing this stage awards the player 500 coins.
	Stage 13B	Dr. Peach Dr. Wario	Within a 70 second time limit, players need to eliminate all viruses, collect all purple coins and collect all keys. In this stage, the leftmost and rightmost keys and doors have columns of viruses between them, while the middle key and door have crates between them. In the other columns, purple coins in rows of three and colorful crates in rows of three are placed in alternate rows. Purple coins are unlocked in the following sequence: The coins in the eighth row. The coins in the seventh row. The coins in the sixth row. The coins in the fifth row. The coins in the fourth row. The coins in the third row. The coins in the second row. Completing this stage awards the player 500 coins.
	Stage 13C	Dr. Dry Bowser Dr. Wendy	Within a 90 second time limit, players need to eliminate all viruses and collect all coins from Coin Blocks. In this stage, the ring of barrels contain viruses, and the ring of dust contain barriers. Barriers in dust will not switch on or off. All Brick Blocks contain coins. Completing this stage awards the player 1000 coins and a Staff Ticket.

Special Stage

Image	Stage	Best Doctors	Overview
	Special Stage	Dr. Larry Dr. Wario	The objective of this stage is to eliminate all viruses and collect all keys. In this stage, keys are blocked by different things before the doors. In the lower rows, the doors are half-frozen. The following rows have hidden doors in Brick Blocks. Colorful crates are between the keys and doors in the next rows. The following rows have barriers between the keys and doors. Near the top of the stage, doors are locked behind cages with its corresponding lock block at the corner. This stage will scroll for one line each time enough objects are cleared, and will stop after 7 lines are introduced. Completing this stage awards the player 1000 coins and Dr. Fire Luigi.

Profiles

• Dr. Mario World Twitter:
  • Red: "Looks like new stages are coming on Mar. 5, 1 AM PT. Seeing the sparkling crystal underneath the purple sludge makes me excited!"
  • Yellow: "New stages are added, I heard! I wonder how much the big sparkly thingies would sell for? Oh, and the reward for World 13's special stage is Dr. Fire Luigi! That huge L he makes is a bit scary, though..."