Silent Knight

Move - WASD/↑ ↓→ ← 
Interact - Space

Hark! Your good and noble King has learned at last of the location of a lost holy treasure - a Grail of some renown that shall bring great honour and fortune to his land and people. 

Alas! Tis dwelling present deep in the chambers of some Bleak Fortress,  and lo these many weeks of siege have dug his forces little ground. And now come the feast days of many saints, and as God demands the weapons of his servants shall be cast aside for the duration.

Thus! His Majesty turns to you, his most Dutiful and Surreptitious knight. None but your skills at infiltration bear any chance of penetrating those walls. Creep inside and  rescue the Grail. Of course, you shan't doff your gleaming plate, you are a knight! That may present some challenge in silent movement, but that is naught that your ample  powers cannot best.