crack
problem-solve
square the circle
enodation
solvability
solving
resolve
resolution
decipher
unmanageable
uncontrollable
hard nut to crack
firefighting
answer
solutionally
cure
tough nut to crack
solvable
a problem shared is a problem halved
subproblem
solution
unmess
resolvable
upsolve
pig
problem
talk out
brainteaser
boil the ocean
solve
insolvable
unsoluble
dissolution
problematic
dissolving
unriddle
unresolvable
unsolvable
torfer
iron out
doo-doo
ticket
science
trouble-shoot
solutional
job
rub
troubleshoot
unpick
go at
unpuzzle
hack away
killer
mean
escape fire
ambitious
enmesh
mountain to climb
dissolve
one-banana problem
throw down the gauntlet
figure
in a bind
brain-teaser
stumper
yak shaving
conundrum
line of attack
riddle
crux
enigma
approach
meliorate
task
work
Gordian knot
bring off
lick
figure out
puzzle out
work out
brainstorm
puzzle over
counterdifficulty
goat rope
rub along
nail the hammer on the head
come out in the wash
three-pipe problem
skittish
intractable
problematize
toughness
challenging