also: ろっぴゃくけん
noun
roppyakken (hanafuda game)
A specific hanafuda game; the term is domain-specific and may not be widely known outside of hanafuda enthusiasts.
花札の遊び方の一つに六百間というのがある。
One of the ways to play hanafuda is a game called roppyakken.
The name literally means 'six hundred ken', but the exact origin of the name is uncertain; it is a traditional hanafuda game term.