Forgotten Challenge

"Forgotten Challenge" is an instrumental piece composed by Yoko Shimomura. It was first featured in Kingdom Hearts Chain of Memories.

Appearances
In Kingdom Hearts Chain of Memories, Kingdom Hearts Re:Chain of Memories, Kingdom Hearts Re:coded, and their respective HD remakes, this piece is used as the battle theme for Castle Oblivion.

Kingdom Hearts Chain of Memories/Kingdom Hearts Re:Chain of Memories
Battle theme for Castle Oblivion.

Kingdom Hearts Re:coded
This piece is used as the battle theme for Castle Oblivion and can be heard while fighting Tidus,   , and      in Castle Oblivion.

Composition
"Forgotten Challenge" is approximately two minutes and twenty-nine seconds long and plays at a tempo of 160 beats per minute and has a time signature of 4/4 time. The piece lacks an introduction and conclusion, allowing for smooth transitions between loops. The instrumentation is composed of: organ, harp, strings, timpani, cymbals, choir, and low brass instruments.