The latest event in Overwatch, Uprising, is live until May 1.

The Uprising event takes place seven years prior to the present-day Overwatch, as is seeks to introduce further backstory to an important moment in the game’s lore.

Uprising follows Tracer – on her first mission – along with Mercy, Torbjörn, and Reinhardt as they battle to stop a group of Omnic separatists known as the Null Sector.

Players can battle in a four-player co-op session, and the regular loot boxes have been replaced with special Uprising loot. The event will offer players the chance to gain mementos from Overwatch’s pre-Uprising era.