What are your students studying?
This might help:
The top of the throne: Simon the Sorcerer, Indiana Jones and the Fate of Atlantis & Monkey island - Giving me a lot of laughs, the most strange puzzles to solve and one of the funniest protagonists to play Beneath A Steel Sky: - Stunningly good atmosphere and a hilarious robot sidekick Broken...
My own list—I haven't played them all, just compiled from various sources:
Day of the Tentacle Remastered
Her Story *
Monkey Island—various *
Return of the Obra Dinn
Sam & Max
The Longest Journey *
The Stanley Parable *
What Remains of Edith Finch
I've played the starred ones, and recommend them all.
PCG has a good list from a few years ago:
Modern puzzlers, exploration games, and more than a few point-and-click classics fill our massive list of great adventures.