How did hamlet alter the kings plan to have him beheaded?

In Shakespeare's "Hamlet," the king's plan to have Hamlet beheaded is thwarted when Hamlet discovers the contents of the letter that Rosencrantz and Guildenstern are carrying to England. Instead of following the king's orders, Hamlet alters the letter, instructing that Rosencrantz and Guildenstern be executed instead. This clever manipulation allows Hamlet to escape his fate and ultimately return to Denmark, setting the stage for the play's tragic conclusion.