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As a follow-up to the first This is a crossudoku puzzle, I decided to make a new one.

Here are the clues:

Horizontal:

D2-F2 The sum of three consecutive prime numbers
B3-E3, F9-I9 A novel by George Orwell
A5-C5 Number of countries in the world
H5-I5 The number of minutes an iguana can stay under water
A6-B6 Bones in your foot
B7-C7 Giraffe tongue in inches
B7-G7 Number of litres of fuel a Boeing 747 airliner can hold

Vertical

B3-B6 Longest street in km (or the popular misconception for it)
D2-D5 Braille alphabet was invented
D6-D8 The number of octominoes
C1-C3, G7-G9 A cube of a square
H1-H2 A square
H3-H4 Ga
I2-I4 A square

Not 100% sure I have it nailed, but I got down to one...

Horizontal:


D2-F2 The sum of three consecutive prime numbers - since D2 is $1$ from Braille clue and E3 is $4$ from Orwell clue, $159$, $173$, or $187$ - say 1AB

B3-E3, F9-I9 A novel by George Orwell - $1984$

A5-C5 Number of countries in the world - $195$ (according to the U.N.)

H5-I5 The number of minutes an iguana can stay under water - $30$ ($0$ can't be right and can't start with $3$ due to Ga) - say 2C

A6-B6 Bones in your foot - $26$

B7-C7 Giraffe tongue in inches - I found "$18$-$20$" but a leading $1$ contradicts Braille as $1824$, so $21$?

B7-G7 Number of litres of fuel a Boeing 747 airliner can hold - I've seen reference to $216,000$ litres (fits with giraffe $21$ and the $6$ of octominoes), G7 is $7$ from "cube of a square" - say 216DE7


Vertical:


B3-B6 Longest street in km (or the popular misconception for it) - Yonge Street $1896$

D2-D5 Braille alphabet was invented - $1824$

D6-D8 The number of octominoes - $369$

C1-C3, G7-G9 A cube of a square - No six digit ones work, so $729$

H1-H2 A square - disregarding $3$, $1$, and $8$ from all: $25$, $49$, or $64$ - say FG

H3-H4 Ga - Gallium, atomic number $31$

I2-I4 A square - disregarding $2$ and $1$ from I2, $1$, $9$, $8$, $4$, and $3$ from I3, $8$, $2$, and $1$ from I4, and $4$ from all places: $529$, $576$, $625$, or $729$ - say HIJ

This gives:

 
 A B C D E F G H I
 +-------+-------+-------+
 1 | · · 7 | · · · | · F · |
 2 | · · 2 | 1 A B | · G H |
 3 | · 1 9 | 8 4 · | · 3 I |
 +-------+-------+-------+
 4 | · 8 · | 2 · · | · 1 J |
 5 | 1 9 5 | 4 · · | · 2 C |
 6 | 2 6 · | 3 · · | · · · |
 +-------+-------+-------+
 7 | · 2 1 | 6 D E | 7 · · |
 8 | · · · | 9 · · | 2 · · |
 9 | · · · | · · 1 | 9 8 4 |
 +-------+-------+-------+

...and a single solution that fits all of the constraints I placed on values A,B,C,F,G,H,I, and J:

 
 A B C D E F G H I
 +-------+-------+-------+
 1 | 8 3 7 | 5 9 6 | 1 4 2 |
 2 | 6 4 2 | 1 7 3 | 8 9 5 |
 3 | 5 1 9 | 8 4 2 | 6 3 7 |
 +-------+-------+-------+
 4 | 7 8 3 | 2 5 9 | 4 1 6 |
 5 | 1 9 5 | 4 6 7 | 3 2 8 |
 6 | 2 6 4 | 3 1 8 | 5 7 9 |
 +-------+-------+-------+
 7 | 9 2 1 | 6 8 4 | 7 5 3 |
 8 | 4 7 8 | 9 3 5 | 2 6 1 |
 9 | 3 5 6 | 7 2 1 | 9 8 4 |
 +-------+-------+-------+

Oh ... there seems to be a guess already ... that's why even though I'm not done yet I'll share my work so far.

--- After edit ---

Now here's my solution

Horizontal:

D2-F2 The sum of three consecutive prime numbers

First there was a eight options but the Braille clue gave away that the number starts with 1 so the prime numbers left to consider were 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71.

They make up eight sums: 109, 121, 131, 143, 159, 173, 187, 199
Of these sums can be easily dismissed since they contain double numbers or zeroes leaving us with: 143, 159, 173, 187
The Orwell clue rules out the options containing 4 or 8. What's left: 159, 173
Further sudokuing (is that a word?) reveals a number 5 in the square ruling out 159 and leaving us with 173 as answer

B3-E3, F9-I9 A novel by George Orwell

Quick googling reveals 1984

A5-C5 Number of countries in the world

193 if we count UN-countries only, 195 if we count the other two, but the digits 19... are definite. After some consideration ... it kind of says all countries, therefore 195 must be the answer.

H5-I5 The number of minutes an iguana can stay under water

Googling says 30 but that cannot be true since 0 is not a number found in Sudokus, numbers higher than 30 don't make much sense when googling, so a leading 2... seems plausible but I left that open for now since that is not definite.

Since 26, 27 and 29 can be ruled out by sudokuing and the number has to be at least close to 30, the solution to this one must be 28

A6-B6 Bones in your foot

26 definite answer

B7-C7 Giraffe tongue in inches

Google says 18 - 20 inches, which means 18 or 19, since 20 contains a zero. However, the 747 clue gives away that it really must be 21 even though I didn't find that info during research.

B7-G7 Number of litres of fuel a Boeing 747 airliner can hold

I found online that there are several types of Boeing 747 which have different fuel capacities that begin with a leading 1 or 2. But the longest road clue gives away that it cannot be 1, so there is two types left. The numbers given by the cube of square clue and the octomino clue rule out the larger one leaving 216847 as definite result.

Vertical

B3-B6 Longest street in km (or the popular misconception for it)

Guiness World Records listed Yonge Street for some time but it only has 56km. However, a common misconception said that its length was 1896 km which must be the answer

D2-D5 Braille alphabet was invented

1824, easy, look it up

D6-D8 The number of octominoes

Definite mathematical thing -> definite answer: 369

C1-C3, G7-G9 A cube of a square

The only cube of a square with three digits: 729

H1-H2 A square

Possbile two digit squares: 16, 25, 36, 49, 64, 81

We can rule out 81 with the Orwille clue an 25 with the Iguana clue having now 16, 36, 49, 64 left as guesses.

Some further sudokuing and the 1 from the Ga clue rule out every number with a 1 and a 6: 16, 36, 64, conveniently leaving 49 as final answer.

H3-H4 Ga

This could be a reference to Gallium, which would be 31 on the periodic table.

This could also be numerically encoded, resulting in 71

Having only this two clues I dare make the conclusion, that the second digit is ...1.

> Having 576 as three digit square rules out 71 leaving 31 as answer.

I2-I4 A square

There are a total of 22 possible three digit squares but ruling them out with the rules of Sudoku left me with: 529, 576, 625 and 691
Getting 49 in the double digit square clue rules out 691, leaving 529, 576 and 625
Some sudokuing after guessing the country clue we get 6 as definite last digit and therefore 576 as answer.

After having solved all clues everything left was to solve the Sudoku which went astoundingly fast.

My solution looks as follows

--------+-------+--------

| 8 3 7 | 5 9 6 | 1 4 2 |

| 6 4 2 | 1 7 3 | 8 9 5 |

| 5 1 9 | 8 4 2 | 6 3 7 |

--------+-------+--------

| 7 8 3 | 2 5 9 | 4 1 6 |

| 1 9 5 | 4 6 7 | 3 2 8 |

| 2 6 4 | 3 1 8 | 5 7 9 |

--------+-------+--------

| 9 2 1 | 6 8 4 | 7 5 3 |

| 4 7 8 | 9 3 5 | 2 6 1 |

| 3 5 6 | 7 2 1 | 9 8 4 |

--------+-------+--------