Apopalypse Mode has a B.F.B icon in BTD4. In BTD5, this was changed to a skull and cross-bones on a Black Bloon. This mode is unlocked at Rank 31 in BTD4 and BTD5, but Rank 36 in Bloons TD 5 Deluxe. In Bloons TD 4, this mode has infinite rounds; in Bloons TD 5, it only has 400 rounds. The bloons that spawn from waves and spawns are random each time, and this gameplay changes quite a bit between each game. The earliest time possible for the highest type of bloon to spawn on that round is shown, but can vary.