From Cluses, head up via Marnaz to Le Reposoir, turn left onto the Romme road and park in a right-hand bend at the start of Chemin de Méry, marked by a sign.
You can also drive directly to the small resort of Romme from Cluses, via Nancy-sur-Cluses: continue for a few kilometres over the Col de Romme and begin the descent towards Le Reposoir until you reach the bend where the Chemin de Méry starts.
(S/E) Take the Chemin de Méry southwards. It begins to descend slightly towards Plan de Brion before starting a steep, winding climb through the forest.
(1) At the top of the switchbacks, this access path crosses to the right, passing through an avalanche couloir. It continues to climb via a few switchbacks and long traverses along the slope, until it emerges from the forest into the mountain pasture. Continue southwards on level ground to reach the Chalets de Méry.
(2) From the chalets, climb up to the cross and continue along the path, if visible, heading north-east up towards a grassy ridge descending from the Pointe du Château.
(3) Leave the path which turns towards the Col de la Gueule à Vent and climb the ridge south-eastwards then eastwards (watch out for cornices) to the clearly visible summit of the Pointe du Château.
(4) You can descend via the ridge you climbed or, better still, follow the south-eastern ridge towards the Col du Château.
(5) Turn right to descend the snow-covered slopes towards the west (several routes available), towards the Chalets de Méry.
(2) Descend through the forest via the path you took on the way up. (S/E)