diff --git a/exercises/practice/anagram/.meta/tests.toml b/exercises/practice/anagram/.meta/tests.toml
index 4f43811..8b680da 100644
--- a/exercises/practice/anagram/.meta/tests.toml
+++ b/exercises/practice/anagram/.meta/tests.toml
@@ -78,3 +78,11 @@ include = false
 [33d3f67e-fbb9-49d3-a90e-0beb00861da7]
 description = "words other than themselves can be anagrams"
 reimplements = "a0705568-628c-4b55-9798-82e4acde51ca"
+
+[a6854f66-eec1-4afd-a137-62ef2870c051]
+description = "handles case of greek letters"
+include = false
+
+[fd3509e5-e3ba-409d-ac3d-a9ac84d13296]
+description = "different characters may have the same bytes"
+include = false
diff --git a/exercises/practice/change/.meta/tests.toml b/exercises/practice/change/.meta/tests.toml
index d2cf3ed..2d2f44b 100644
--- a/exercises/practice/change/.meta/tests.toml
+++ b/exercises/practice/change/.meta/tests.toml
@@ -33,6 +33,9 @@ description = "possible change without unit coins available"
 [9a166411-d35d-4f7f-a007-6724ac266178]
 description = "another possible change without unit coins available"
 
+[ce0f80d5-51c3-469d-818c-3e69dbd25f75]
+description = "a greedy approach is not optimal"
+
 [bbbcc154-e9e9-4209-a4db-dd6d81ec26bb]
 description = "no coins make 0 change"
 
diff --git a/exercises/practice/change/test-change.bats b/exercises/practice/change/test-change.bats
index 206c115..2252dc5 100644
--- a/exercises/practice/change/test-change.bats
+++ b/exercises/practice/change/test-change.bats
@@ -88,6 +88,16 @@ END_INPUT
     assert_output "4 4 4 5 5 5"
 }
 
+@test "a greedy approach is not optimal" {
+    [[ $BATS_RUN_SKIPPED == "true" ]] || skip
+    run gawk -f change.awk <<END_INPUT
+1 10 11
+20
+END_INPUT
+    assert_success
+    assert_output "10 10"
+}
+
 @test "no coins make 0 change" {
     [[ $BATS_RUN_SKIPPED == "true" ]] || skip
     run gawk -f change.awk <<END_INPUT
diff --git a/exercises/practice/darts/.docs/instructions.md b/exercises/practice/darts/.docs/instructions.md
index 5e57a86..6518201 100644
--- a/exercises/practice/darts/.docs/instructions.md
+++ b/exercises/practice/darts/.docs/instructions.md
@@ -1,6 +1,6 @@
 # Instructions
 
-Write a function that returns the earned points in a single toss of a Darts game.
+Calculate the points scored in a single toss of a Darts game.
 
 [Darts][darts] is a game where players throw darts at a [target][darts-target].
 
@@ -16,7 +16,7 @@ In our particular instance of the game, the target rewards 4 different amounts o
 The outer circle has a radius of 10 units (this is equivalent to the total radius for the entire target), the middle circle a radius of 5 units, and the inner circle a radius of 1.
 Of course, they are all centered at the same point — that is, the circles are [concentric][] defined by the coordinates (0, 0).
 
-Write a function that given a point in the target (defined by its [Cartesian coordinates][cartesian-coordinates] `x` and `y`, where `x` and `y` are [real][real-numbers]), returns the correct amount earned by a dart landing at that point.
+Given a point in the target (defined by its [Cartesian coordinates][cartesian-coordinates] `x` and `y`, where `x` and `y` are [real][real-numbers]), calculate the correct score earned by a dart landing at that point.
 
 ## Credit
 
diff --git a/exercises/practice/darts/.meta/config.json b/exercises/practice/darts/.meta/config.json
index d7b62b9..9480806 100644
--- a/exercises/practice/darts/.meta/config.json
+++ b/exercises/practice/darts/.meta/config.json
@@ -13,6 +13,6 @@
       ".meta/example.awk"
     ]
   },
-  "blurb": "Write a function that returns the earned points in a single toss of a Darts game.",
+  "blurb": "Calculate the points scored in a single toss of a Darts game.",
   "source": "Inspired by an exercise created by a professor Della Paolera in Argentina"
 }
diff --git a/exercises/practice/raindrops/.meta/config.json b/exercises/practice/raindrops/.meta/config.json
index 0c54514..24e7bbb 100644
--- a/exercises/practice/raindrops/.meta/config.json
+++ b/exercises/practice/raindrops/.meta/config.json
@@ -13,7 +13,7 @@
       ".meta/example.awk"
     ]
   },
-  "blurb": "Convert a number to a string, the content of which depends on the number's factors.",
+  "blurb": "Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.",
   "source": "A variation on FizzBuzz, a famous technical interview question that is intended to weed out potential candidates. That question is itself derived from Fizz Buzz, a popular children's game for teaching division.",
   "source_url": "https://en.wikipedia.org/wiki/Fizz_buzz"
 }
diff --git a/exercises/practice/reverse-string/.meta/tests.toml b/exercises/practice/reverse-string/.meta/tests.toml
index 2113a53..52fda99 100644
--- a/exercises/practice/reverse-string/.meta/tests.toml
+++ b/exercises/practice/reverse-string/.meta/tests.toml
@@ -1,6 +1,13 @@
-# This is an auto-generated file. Regular comments will be removed when this
-# file is regenerated. Regenerating will not touch any manually added keys,
-# so comments can be added in a "comment" key.
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
 
 [c3b7d806-dced-49ee-8543-933fd1719b1c]
 description = "an empty string"
@@ -19,3 +26,15 @@ description = "a palindrome"
 
 [b9e7dec1-c6df-40bd-9fa3-cd7ded010c4c]
 description = "an even-sized word"
+
+[1bed0f8a-13b0-4bd3-9d59-3d0593326fa2]
+description = "wide characters"
+include = false
+
+[93d7e1b8-f60f-4f3c-9559-4056e10d2ead]
+description = "grapheme cluster with pre-combined form"
+include = false
+
+[1028b2c1-6763-4459-8540-2da47ca512d9]
+description = "grapheme clusters"
+include = false
diff --git a/exercises/practice/say/.docs/instructions.md b/exercises/practice/say/.docs/instructions.md
index fb4a6df..ad3d347 100644
--- a/exercises/practice/say/.docs/instructions.md
+++ b/exercises/practice/say/.docs/instructions.md
@@ -30,8 +30,6 @@ Implement breaking a number up into chunks of thousands.
 
 So `1234567890` should yield a list like 1, 234, 567, and 890, while the far simpler `1000` should yield just 1 and 0.
 
-The program must also report any values that are out of range.
-
 ## Step 3
 
 Now handle inserting the appropriate scale word between those chunks.
diff --git a/exercises/practice/sieve/.docs/instructions.md b/exercises/practice/sieve/.docs/instructions.md
index 3adf1d5..085c0a5 100644
--- a/exercises/practice/sieve/.docs/instructions.md
+++ b/exercises/practice/sieve/.docs/instructions.md
@@ -1,28 +1,42 @@
 # Instructions
 
-Your task is to create a program that implements the Sieve of Eratosthenes algorithm to find prime numbers.
+Your task is to create a program that implements the Sieve of Eratosthenes algorithm to find all prime numbers less than or equal to a given number.
 
-A prime number is a number that is only divisible by 1 and itself.
+A prime number is a number larger than 1 that is only divisible by 1 and itself.
 For example, 2, 3, 5, 7, 11, and 13 are prime numbers.
-
-The Sieve of Eratosthenes is an ancient algorithm that works by taking a list of numbers and crossing out all the numbers that aren't prime.
-
-A number that is **not** prime is called a "composite number".
+By contrast, 6 is _not_ a prime number as it not only divisible by 1 and itself, but also by 2 and 3.
 
 To use the Sieve of Eratosthenes, you first create a list of all the numbers between 2 and your given number.
 Then you repeat the following steps:
 
-1. Find the next unmarked number in your list. This is a prime number.
-2. Mark all the multiples of that prime number as composite (not prime).
+1. Find the next unmarked number in your list (skipping over marked numbers).
+   This is a prime number.
+2. Mark all the multiples of that prime number as **not** prime.
 
 You keep repeating these steps until you've gone through every number in your list.
 At the end, all the unmarked numbers are prime.
 
 ~~~~exercism/note
-[Wikipedia's Sieve of Eratosthenes article][eratosthenes] has a useful graphic that explains the algorithm.
-
 The tests don't check that you've implemented the algorithm, only that you've come up with the correct list of primes.
-A good first test is to check that you do not use division or remainder operations.
-
-[eratosthenes]: https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes
+To check you are implementing the Sieve correctly, a good first test is to check that you do not use division or remainder operations.
 ~~~~
+
+## Example
+
+Let's say you're finding the primes less than or equal to 10.
+
+- List out 2, 3, 4, 5, 6, 7, 8, 9, 10, leaving them all unmarked.
+- 2 is unmarked and is therefore a prime.
+  Mark 4, 6, 8 and 10 as "not prime".
+- 3 is unmarked and is therefore a prime.
+  Mark 6 and 9 as not prime _(marking 6 is optional - as it's already been marked)_.
+- 4 is marked as "not prime", so we skip over it.
+- 5 is unmarked and is therefore a prime.
+  Mark 10 as not prime _(optional - as it's already been marked)_.
+- 6 is marked as "not prime", so we skip over it.
+- 7 is unmarked and is therefore a prime.
+- 8 is marked as "not prime", so we skip over it.
+- 9 is marked as "not prime", so we skip over it.
+- 10 is marked as "not prime", so we stop as there are no more numbers to check.
+
+You've examined all numbers and found 2, 3, 5, and 7 are still unmarked, which means they're the primes less than or equal to 10.
diff --git a/exercises/practice/two-bucket/.docs/instructions.md b/exercises/practice/two-bucket/.docs/instructions.md
index 7249deb..30d779a 100644
--- a/exercises/practice/two-bucket/.docs/instructions.md
+++ b/exercises/practice/two-bucket/.docs/instructions.md
@@ -11,7 +11,7 @@ There are some rules that your solution must follow:
      b) the second bucket is full
   2. Emptying a bucket and doing nothing to the other.
   3. Filling a bucket and doing nothing to the other.
-- After an action, you may not arrive at a state where the starting bucket is empty and the other bucket is full.
+- After an action, you may not arrive at a state where the initial starting bucket is empty and the other bucket is full.
 
 Your program will take as input:
 
diff --git a/exercises/practice/two-fer/.docs/instructions.md b/exercises/practice/two-fer/.docs/instructions.md
index 37aa752..adc5348 100644
--- a/exercises/practice/two-fer/.docs/instructions.md
+++ b/exercises/practice/two-fer/.docs/instructions.md
@@ -2,14 +2,13 @@
 
 Your task is to determine what you will say as you give away the extra cookie.
 
-If your friend likes cookies, and is named Do-yun, then you will say:
+If you know the person's name (e.g. if they're named Do-yun), then you will say:
 
 ```text
 One for Do-yun, one for me.
 ```
 
-If your friend doesn't like cookies, you give the cookie to the next person in line at the bakery.
-Since you don't know their name, you will say _you_ instead.
+If you don't know the person's name, you will say _you_ instead.
 
 ```text
 One for you, one for me.
diff --git a/exercises/practice/two-fer/.docs/introduction.md b/exercises/practice/two-fer/.docs/introduction.md
index 8c12439..5947a22 100644
--- a/exercises/practice/two-fer/.docs/introduction.md
+++ b/exercises/practice/two-fer/.docs/introduction.md
@@ -5,4 +5,4 @@ Two-for-one is a way of saying that if you buy one, you also get one for free.
 So the phrase "two-fer" often implies a two-for-one offer.
 
 Imagine a bakery that has a holiday offer where you can buy two cookies for the price of one ("two-fer one!").
-You go for the offer and (very generously) decide to give the extra cookie to a friend.
+You take the offer and (very generously) decide to give the extra cookie to someone else in the queue.