Why are some games locked or greyed out?

On the free plan, you can play the current free games. Other Game Room games look washed out. When you open one, My Membership says that it is a Premium game. Students see only the Arcade games available on your plan.

• A paid plan opens every game in that plan. The Game Room plan opens the whole-class games, the Arcade plan opens the Arcade games, and the Bundle opens all of them.
• Choose a plan on My Membership. The free trial page offers 7 days free on any paid plan.

Paid, but games are still locked? See I paid, but my membership does not show as active.