Victoriae has created a game for their class

The definition of opening

Synonyms:	opportunity, time, inaugurate, window, beginning, start, launch, birth, dawn, outset, onset, overture, initiation, inception, commencement, hole, break, space, tear, split, crack, gap, rent, breach, slot, outlet, vent, puncture, rupture, aperture, cleft, chink, fissure, orifice, perforation, interstice, chance, place, moment, occasion, look-in (informal), job, position, post, situation, vacancy, first, early, premier, primary, initial, maiden, inaugural, commence, introductory, initiatory
Antonyms:	ending, blockage

From Collins