CRYSTAL-PLAY(1) Crystal Compiler Command Line Reference Guide CRYSTAL-PLAY(1) (NAME) crystal-play - (playground) (SYNOPSIS) crystal play [options] [file] (DESCRIPTION) (playground) crystal 8080 . (OPTIONS) -p PORT, --port PORT . 8080 . -b HOST, --binding HOST (bind) IP . -v, --verbose . crystal 1.21.0 2026-07-23 CRYSTAL-PLAY(1)