Kanagawa
Must you play a Lesson card you kept in hand?
The rulebook says you may keep a card and play it later, and several players, one relaying a publisher reply, agree it is never forced; there is no direct official post.
- Kanagawa rulebook · Rulebook · Optional
- 2d20 · Community · 2017-02-06
- Mattintheweb · Community · 2017-02-08
No. A kept card can stay in hand, and you are not required to play it.