Chapter 5 - Playing
Playing is an action applying to one thing.
Understand "play [something preferably held]" as playing.
Understand "play with [something preferably held]" as playing.
Check playing (this is the block playing rule): [1]
say "[The noun] [are] not a game or a musical instrument." instead.
Note
[1]. The rule is named so that it can be conditionally ignored when playing the flute.