Man pages matching name flblocks in section 6:

flblocks.6.en	debian 10 / fltk1.1-games
flblocks.6.en	debian 10 / fltk1.3-games
flblocks.6.en	debian 11 / fltk1.1-games
flblocks.6.en	debian 11 / fltk1.3-games
flblocks.6.en	debian 12 / fltk1.1-games
flblocks.6.en	debian 12 / fltk1.3-games