Todos corrían por un laberinto + todos buscaban el queso + todos se alimentaban con queso + el queso los hacía felices a todos. Todos corrian por un laberinto buscando el queso que era su alimento y que les gustaba mucho.

What Martin said is basically correct, but I'd translate it slightly differently: They all ran through a labyrinth in search of the cheese with which they fed themselves and which made them happy. The part that confuses you may be the last part, starting with "con que se alimentaban..." It's a long prepositional phrase that describes the cheese (queso). Alimentarse is a reflexive verb literally meaning "to nourish oneself" or colloquially, "to eat." In "los hacía felices," "los" is a direct object pronoun referring back to "todos". The subject of the verb "hacía" is "el queso." Another way to phrase it: They all ran through a labyrinth in search of the cheese. The cheese nourished them, and the cheese made them happy. Note that corrían and hacía are spelled with accent marks.

Io penso que puó essere il mouse, perché solo questo animale mangia formaggio. Va bene. Ciao!

BillT Tu ortografía esta bien. Los animales que son felices comiendo queso y que su habitat son los laberintos, supuestamente son "las ratas y los ratones", es una explicación sonia

Is this about rats? All ran through a labyrinth searching for the cheese which they ate and which made them happy.