The longest, but safest/easiest way up from the Val Martello/ Martelltal (South-Tirol side)

From the end of the road (Gasthaus Enzian), follow the path to Rifugio Nino Corsi / Zufallhütte.

Then head up the little couloir on the right (W) of the waterfall (frozen), and follow the path to the large flat area around 2350m (stone dam on the W side) bellow the Marteller Huette. Don't climb up to the hut, but instead, follow the main valley to the East.

Follow the wide valley, mixture of flat parts and steeper steps, always going E, until around 2750m where the Langenferner glacier starts. Head up the glacier in a wide circle, staying on the N/E side (left bank) to avoid the seracs until you reach the Rifugio Casati - Guasti.

Then follow the wide ridge to the pass between the two summits (Cevedale on the SW, slightly lower Zufallspitze to the NE), and then the steeper part to the summit (might need to take skis off and continue with crampons - careful of crevasses in this part)

Descent:
same way