Boss Time Attack Challenge

Boss Time Attack Challenge (ボスタイムアタック, Bosu Taimu Atakku, lit. "Boss Time Attack") is a series of four quests in Kingdom Hearts Unchained χ / Union χ, in which players can obtain Event Coins to unlock Board #1: Sora & Chip & Dale and Board #2: Jewels. It was available from April 15 to 30, 2019 in both versions.

• Boss Time Trial: General
• Boss Time Trial: Impenetrable
• Boss Time Trial: Restoration
• Boss Time Trial: First Strike