Man pages matching name xcubes in section 6:

xcubes.6.en	debian 10 / xmpuzzles
xcubes.6.en	debian 10 / xpuzzles
xcubes.6.en	debian 11 / xmpuzzles
xcubes.6.en	debian 11 / xpuzzles
xcubes.6.en	debian 12 / xmpuzzles
xcubes.6.en	debian 12 / xpuzzles