Hidden blade is a machine that brings out a blade when it is used. Hidden blade kills enemies very fast when unnoticed making it an excellent weapon for assassinations. AltaÃ¯r can use his hidden blade to kill enemies that are unaware of him silently at close range.
AltaÃ¯r can throw his knives at enemies when they are too far for hidden blade or sword. Throwing knives can also be used to kill enemies silently. Since AltaÃ¯r doesn't collect these throwing knives after throwing them he must resupply them by pickpocketing blacksmiths.
Sword is the best weapon for AltaÃ¯r when he encounters enemies at close range and don't want or is unable to run away and hide. It's strong and can easily take down enemies.