Hello! The track now has 60 practice exercises. There are roughly 150 exercises in the problem spec. Would anyone like to contribute to the track by adding exercises? If so, please comment below and I can work with you!
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Unimplemented problem spec exercises as of now below. Note, some make not be suitable for GDScript and may eventually get marked foregone. If it’s not a good fit, ask first 
affine-cipher
baffling-birthdays
bank-account
book-store
bottle-song
bowling
change
clock
complex-numbers
connect
crypto-square
diamond
dnd-character
dominoes
dot-dsl
error-handling
forth
go-counting
grade-school
grep
high-scores
house
intergalactic-transmission
isbn-verifier
kindergarten-garden
knapsack
largest-series-product
ledger
lens-person
line-up
list-ops
markdown
meetup
micro-blog
ocr-numbers
paasio
palindrome-products
parallel-letter-frequency
pascals-triangle
piecing-it-together
pig-latin
poker
pov
proverb
queen-attack
rail-fence-cipher
react
rectangles
relative-distance
rest-api
rna-transcription
roman-numerals
rotational-cipher
satellite
say
sgf-parsing
split-second-stopwatch
strain
tournament
transpose
tree-building
twelve-days
word-search
wordy
zebra-puzzle
zipper
robot-name
state-of-tic-tac-toe
yacht