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
Field theme for Castle Oblivion.

Kingdom Hearts Re:coded
This piece is used as the field 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.