Easter 2015 was an event introduced on 3 April 2015. Like all previous Easter events, it involved Easter eggs spawning on maps. It had a special event map. This event ended on 3 June 2015 when the Fishing Event 2015 started.
Most vanilla and normal rooms would spawn with an Easter egg in the map, usually in harder-to-reach places.
When the mouse collected the egg, the egg would become transparent to mark it is taken by the player. The mouse then had to bring the cheese to the hole, and the player would obtain a random consumable.
There would be a random chance that a special Easter map would play. Like shaman rooms, mice could die if objects “suffocated” them or if they fell from too high. The survivor would obtain progress to the special title.
Similar to the survivorgame mode, the shaman’s objective was to kill the mice. If all mice die, the shaman will get a title. The shaman was limited to four cannonballs before dying.