In Kingdom Hearts 3D : Dream Drop Distance , Yen Sid gives Sora and Riku the powers to rescue their missing allies .
Anticipating Master Xehanort 's return following the defeat of his Heartless , Ansem , and Nobody , Xemnas , Yen Sid puts Sora and Riku through a Mark of Mastery exam to bestow them with the power necessary to counter Xehanort .
Kingdom Hearts 3D-COLON- Dream Drop Distance