From now until the end of December 29th (UTC time), enjoy DOUBLE XP across ALL games!

Every type of XP boost stacks as a multiplier. For example, a Hive Ultimate member (75% boost) will have a minimum of a 175% XP boost during this week. You can raise this further by having a login streak (up to 10%) and using XP Boosters (50% extra for an hour), for a maximum of 235% total boost.