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definitions and information are taken from Rohan Rao blog & Sudopedia

Can be named also Outside Greater

Origin: from a idea of our friend Moso,he is a musician and named this variant "Rossini", thinking at Rossini's crescendo and diminuendo.
da un idea di Moso, che è un musicista e si è ispirato ai crescendo e diminuendo Rossiniani
Rules:
Place numbers in the grid such that each row, column and 3x3 box contain the numbers 1 to 9. The first 3 digits in the row (column) are in ascending or descending order according to the arrows. The dark rule applies: if there is no arrows, numbers can not be in ascending or descending order.

Inserire i numeri in modo che ogni riga, colonna, settore contenga i numeri da 1 a 9. I primi 3 numeri nella riga (colonna) sono in ordine ascendente o discendente secondo il senso delle frecce. Vale la regola oscura; se non ci sono frecce, i numeri non possono essere in ordine ascendente o discendente



Solution