Rule 1: All travel is Point n Click, no free roaming.
Rule 2: All gameplay emphasizes exploration and/or puzzle solving.
Rule 3: Survival Horror does not count. If something kills you, it should either come from a mistake such as clicking the wrong object or using the wrong item or a timed event. No random jumpscares or luck-based survival.
Rule 4: Visual Novels don't count either.
Rule 5: Hidden Object where the whole point is to find stuff in the background does not count.
Recommend whatever you find.