rubik cube

preliminary (adj)

coming before a more important action or event, especially introducing or preparing for it
example: It was while he was working as a teacher that he began the_____work on an invention that he called the “magic cube”

diagonally (adv)

in a straight and sloping way that is not horizontal or vertical
example: Smaller cubes of the rubik could be turned in any direction, except _____

attempt to (phrase)

try to do something, especially something difficult
example: Rubik _______join the cubes together by using elastic bands to ensure that the cubes moved independently

assemble (v)

to come together in a single place or bring parts together in a single group
example: then Rubik came up with a solution is to_____them using a rounded interior