achievement

blank

challenge

challenging

complete

completing

completion

concept

connect

connecting

connection

difficulty

element

elements

empty

finish

finished

finishing

fun

game

hand

hands

hold

holding

jigsaw

jigsaws

lapse

matching

missing

patience

patient

pattern

piece

pieces

play

playing

puzzle

puzzles

puzzling

shapes

skill

solution

solutions

solving

success

time

timelapse

toy

toys

white