UNLOCKING the Room 1665 & finding the DARKASSO item is not easy LOL in Vampire Survivors

There are a total of 16 rooms (including the player's spawn room) connected by corridors. Rooms are unlocked based on the total number of enemies defeated. Each room unlocks at specific kill milestones: 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, and finally 1665 — the last room is unlocked at 1665 kills, not 1500. The type of enemies encountered may change depending on how many rooms have been unlocked and how much time has passed. Boss enemies generally have less health compared to non-boss enemies. Unlike in normal stages, enemies do not despawn when they are outrun or move out of the player’s view. Additionally, there is no option to select an arcana when the player first spawns. Instead, the player must defeat 100 enemies to unlock the next room, which contains the arcana chest. There are many light sources placed at predictable locations. Around 11-12 light sources are typically found in each corridor connecting the rooms, and they may slowly respawn over time.