This is an expansion for heptalion, designed by Néstor Romeral Andrés, that transforms it into octalion by adding 8 new tiles with a new symbol (a pink square), a new board and a cotton case.
octalion rules are the same, but you have more tiles per player and the games are longer and deeper. You need the base game heptalion to play octalion.
The new board has 72 cells, each symbol is shown 9 times, and each 'domino' is shown 3 times. This board configuration was discovered by Mark Tilford.