achievement

arrangement

blank

challenge

challenging

complete

completion

concept

connect

connecting

connection

connections

element

elements

empty

finger

fingers

finish

finished

fun

game

games

hand

hands

hold

holding

integration

jigsaw

jigsaws

matching

missing

patience

pattern

piece

pieces

play

playing

puzzle

puzzles

puzzling

shape

shapes

skill

solution

solve

solving

success

successful

white